Fire Must Burn (Sparks & Bainbridge, #8) by Allison Montclair Format: eARC
Source: supplied by publisher via NetGalley
Formats available: hardcover, ebook
Genres: espionage, historical fiction, historical mystery
Series: Sparks & Bainbridge #8
Pages: 255
Published by Severn House on January 6, 2026
Purchasing Info: Author's Website, Publisher's Website, Amazon, Barnes & Noble, Kobo, Bookshop.org, Better World Books
Goodreads
The owners of The Right Sort Marriage Bureau are back, and more determined than ever to bring love matches to the residents of Post-WWII London . . . so something as trivial as
being dragged into a spy mission isn’t going to stop them!
Sparks fly when an old friend comes to town . . .
London, 1947. After recent events have left the normally steadfast Iris Sparks thoroughly shaken, she’s looking forward to some peace. With The Right Sort doing well, she and business partner Gwen Bainbridge are due a holiday. Until Iris’s former boss enlists their help for a secret mission.
Iris, who left British intelligence after the war, is being recruited for her Cambridge connection to one Anthony Danforth. She hasn’t seen Tony in almost ten years, yet she and Gwen must manipulate him into hiring their marriage service.
Tony’s suspected of being a Soviet operative, and an undercover agent posing as his perfect match could discover the truth. Despite her reluctance at being dragged back into the world of espionage, Iris agrees. After all, Tony was once a very good friend. If he’s innocent, she’ll happily prove it. If not? Well, no one ever said being a spy was easy . . .
Those who enjoy reading Kerry Greenwood's Phryne Fisher Mysteries and Dorothy Sayers will adore this warm and witty historical mystery!
My Review:
This series began with The Right Sort of Man about two women opening a marriage bureau in post-World War II London. Miss Iris Sparks, formerly something seriously clandestine during the late war, and Mrs. Gwendoline Bainbridge, formerly a resident of a sanatorium after the death of her husband and the loss of what would have been her second child, start their agency because they both need jobs. Gwen needs to focus on her recovery so can legally reclaim her sanity and independence and regain custody of her remaining son. Iris, so she can pay the rent. They are not from the same social class but they quickly learn that their own weaknesses are the other’s strengths.
Strength they both need when one of their first clients is charged with murdering one of the others.
By this point in the series, now eight books in, Sparks and Bainbridge are ride or die friends and partners, and the tables have sort of turned on the dynamics of their friendship/sisterhood. Sparks is recovering from the loss of her gangster lover, she’s houseboat sitting in lieu of getting her own apartment, and she’s at a low point, just ripe for manipulation by her old boss/spymaster. Bainbridge has reclaimed her legal rights to her life and her remaining child, she’s in the midst of a new romance, and has just signed the Official Secrets Act because Sparks has let too many cats out of too many bags that should have been kept firmly shut in order to save both of them from the consequences of some of their more dangerous cases.
Which puts Sparks and Bainbridge squarely into – or back into in Sparks’ case – the spy game. Not against Britain’s wartime enemies, but against the new enemies all around them. It’s 1947 and one of Sparks’ old friends from Cambridge is suspected of being a Communist. (The UK and the US were seeing communists under every hedgerow in the post-war period, which gave rise to McCarthyism and the “Red Scares” of the 1950s in the US.)
It’s also true that a lot of young people, particularly college students, flirted with both socialism and communism in the 1930s, between the wars and during the Great Depression. And some became communist agents before, during and after the war. A particularly infamous spy ring, the Cambridge Five, was uncovered in the 1950s.
However, this story takes place in 1947, and the Cambridge Five have not been uncovered yet. But Sparks’ friend Tony Danforth, and for that matter, Sparks herself, did flirt with both political movements in their Cambridge days in the mid-1930s. Sparks definitively turned away, the question that the Brigadier needs to answer is whether or not Danforth did as well. His plan is to use Sparks, Bainbridge and the Right Sort Marriage Bureau as a kind of honeytrap for Danforth.
It’s not going to work the way that the Brigadier thinks it will. He’s correct that Danforth is keeping a secret, but he’s very, very wrong about the nature of the secret that Danforth is keeping. Not that he cares. But Sparks and Bainbridge very much do.
Escape Rating A: I’ve been reading this series from its opening in The Right Sort of Man, and have enjoyed every single one. But the tone of the series has changed over the course of those eight books, and the covers tell their own story. The first two covers were a bit soft-focused and reflected the romances that “The Right Sort” Marriage Bureau was working to create. Not that a murder didn’t occur, and not that the plot beats of a murder investigation didn’t drive both stories, but they were sorta/kind cozies – albeit with a more than a few twists.


The next several books, from A Rogue’s Company to Murder at the White Palace, look more like romantic suspense covers, which also represents one facet of those stories. It’s clear just from the covers that Sparks and Bainbridge are in a LOT more danger in those stories, and not just as a result of Sparks’ romance with gangleader Archie Spelling. If you compare the original version of the cover of A Rogue’s Company with the current version (both at left), that turn is made very manifest between the two.
The covers for the previous book, An Excellent Thing in a Woman, and this one, Fire Must Burn, represent another turn. They may be labelled as mysteries, but those are thriller covers, and so they should be. The Cold War is heating up – so to speak – and Iris Sparks and Gwen Bainbridge, both now signatories of the Official Secrets Act, are in the spy game up to their necks as a result of favors owed to Iris’ wartime boss, the mysterious Brigadier. Who is obviously a high-muckety-muck of one sort or another in MI6.
(I recognize that this series also experienced a change in publishers between Murder at the White Palace and An Excellent Thing in a Woman, but have no way of unraveling the reasons behind that ball of wax. I just see that the new covers EXCELLENTLY fit the new direction.)
This eighth entry in the series is a story about youthful folly, the power of privilege, the distribution of collateral damage and the price of consequences. And it kept me glued to my seat from beginning to end.
There were multiple strands to that glue. The story operates in two timelines, Sparks’ and Bainbridge’s 1947 present, AND Sparks’ own mid 1930s past at Cambridge. There are fascinating reveals in both timelines, with a kind of how it started vs. how it’s going feel. Sparks was a barely middle-class female student at Cambridge in the 1930s, and we see her as young, foolish, risk-taking and rule-breaking in a way that both fits with who we know AND shows how far she’s come as well as how the war and her own losses have changed her.
All of which are set in sharp contrast by the young female agent the Brigadier sends to seduce Danforth. A young woman very much like Sparks used to be, reminding her that she’s now 30 and scarred and jaded by her experiences. Especially the experience that set her on the course she is currently on – for both good and ill.
The story concludes with a whole lot of surprising reveals – not so much the whodunnits as a bunch of whydunnits all around. More importantly for both Sparks and Bainbridge, an all too intimate view of the changed nature of what seemed righteous in wartime but has now become a very dirty and dangerously clandestine war. One where not even the supposed “good guys” give a good goddamn about the cost – not even to their own.
It’s clear that Sparks is going to have to find a way to extricate herself and Bainbridge from the mess that necessity and expediency have gotten them into. The question is whether the Brigadier and MI6 will be willing to let them go.
A burning question – possibly literally – for the next book in the series. Hopefully this time next year.
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