After dealing with a series of murders and thefts of intelligence involving the expatriate Norwegian government in Britain (and going off on a bit of an unofficial revenge mission) in book 1, Lt. Billy Boyle (ex-Boston Cop now assigned to be "Uncle Ike's" point man for dealing with... problems that need to go away for the good of the cause) is now in North Africa amidst the Operation Torch landings, the first American offensive of the war, intended to wrest North Africa from the Vichy French (and hopefully gain lots of patriotic (or at least practical) French volunteers for the Allied cause), relieve pressure on the British in Egypt, and open up a new front in Southern Europe. Billy finds himself sent in with the first wave of the landings in hopes of convincing a cabal of pro-Allied French officers (and anti-Fascist revolutionaries) to seize control of Algiers and hand it over to the Allies. Things soon turn pear-shaped: their mission is compromised, Billy and his CO are captured, the resistance uprising is quashed by the French fascists, the Allies find that unexpectedly Vichy #2 Admiral Darlan is in Algiers, quashing any hope of steam-rolling the French into switching sides, and an allied forward hospital is the scene of two murders and a mass-theft of vital medicine, including a priceless shipment of Penicillin. Oh, and Billy is stunned to find that his English girlfriend (and sometime SOE agent) is among the failed resistance fighters captured by the Vichy. So Billy and his allies must navigate the complex tensions of Algeria, having to tread lightly with the Vichy for political reasons, even as all the evidence points to corrupt officers in their ranks being culpable in these vicious crimes. It's not just a question of whodunit but how to bring them to justice when Uncle Ike is doing everything he can to woo the Vichy in Algeria into switching sides before the Germans get their act together. Oh, and rescuing his girlfriend...
I enjoyed Billy Boyle (book 1), but my main source of complaint was that the ending was a bit messy, things just kind of went off the rails. It was satisfying but it was nowhere near as enjoyable as the early part of the book with its deliberately paced introduction of Billy and the mystery he'd been tapped to solve. The book jumped from being a closed room mystery to a spy thriller, and it was a bit jarring. Here we have the opposite problem. The opening few chapters are just plain insane. Billy just keeps walking into problem after problem: every time he turns around someone is getting killed or something dramatically awful is happening. However, after this rather chaotic opening, the book settles down into Billy and company doing the leg work of trying to figure out what's going on and who's responsible and doing a little off-the-books intel/rescue work with British commandos, and it just flows so much better. This is one of the reasons I prefer mysteries where the detective is brought into the problem rather than stumbling over the corpse, you don't have to contrive ridiculous amounts of serendipitous encounters to make the detective see everything, instead somebody else can just relate what happened. In this case, if everything that happened at the hospital happened off-page and was related second-hand, and Billy just had the encounters with the Vichy and the prison bits and then got brought into the penicillin heist/murders, it just would've felt more natural. There's just no good reason to make everything happen while the detective is present. That said, this is really just a stylistic gripe, and it's not something that keeps me from enjoying mysteries (heck, Vivien Chien does it all the time in the Noodle Shop Mysteries, but her detective is so fun, I don't really care), but overusing it just feels unnatural. I also want to say how much I enjoy the way Benn has chosen the settings for his mysteries. In the first book he touched upon the Allies' (ultimately abandoned) plans to liberate Norway and here we are focused on the Allied Invasion/Liberation of North Africa, both of these are rather minor and oft-forgotten parts of the story of the war, and choosing such esoteric settings gives Benn the benefit of putting his readers in a situation where they likely don't know what happened (and thus increase the drama of the background military events), and he's clearly done a lot of research on the events in question. All in all, an intriguing mystery with a fascinating setting and a likeable protagonist: that's a pretty solid combo.