Hard to put my thoughts into words. This sounded like a classic period mystery; the impossible murder, the wartime tensions, the varied cast, all with an extra dash of secret services.
It wasn't that. Strap in?
Early complaints: flat prose, all the suspects on a 2000(?) person ship are sat at the same neat little table, very poor pacing, and lot of loose threads that Im not sure how they'll tie together...
And they don't tie together.
Edit: also the author refused to start dialogue on new lines half the time. Gallagher would look around a room then at the end of the description, someone who wasn't even mentioned in that paragraph starts talking! there was one paragraph that went like this:
"Blah Blah, blah blah," said character A with inflection or whatever. it came across like this, with A doing an action. then B nods and says "Is that so, Character A?"
Where were your editors??????
There's actually two plots here: who killed Dowrich (and then who killed Billie), and who are the German spies and what are they doing? These two plots aren't really linked except by a throwaway line in the last few pages of the book about how the Murder Victim (Dowrich) was blackmailing people so he could go into arms dealing. Protagonist Gallagher sends off a few telegrams then promptly goes chasing up ten wrong trees and telling everyone not to worry about the suspects who are doing dodgy things. When he finally has the answer handed to him (towards the end of the book and in a span of thirty pages) everything falls into place somehow in a move that is both painfully telegraphed and also largely out of nowhere at once. He feels nothing but sympathy for our poor murderer, and suggests sadly that she deserves a second chance despite the fact that she is, at her own admission, an absolute monster in what she did for work and fun back in NY (TW:Sexual abuse, predator behaviour, coercion of minors, lesbian stereotyping that felt straight out of the 60s [do we support women's wrong? yes but not these]) and the fact that she only left because she didn't want to share. second murder was handled better, even though the deductive reasoning was still a little bland, but overall just lacklustre.
And then the German spies! It was Schurz! The man of German origin (who would have thought!) with a German name, who was known to frequent German sympathisers, who was openly being dodgy and sniffing about the ship. Not that our man Gallagher thought so, no, he's just a weirdo but he harmless, will people please stop worrying about him. Schurz's reasoning? Well he just got a contract with the British ministry and the Germans said if the British found out he hung out with Germans (which they already knew) then he would lose it, so he had to sabotage this British ship instead! It's so ridiculous even the book pokes fun at it but, unfortunately, a lampshade is still a lampshade, and stupid reasoming is still stupid.
Then a German U-Boat fires on them! this wasn't part of the German plan to get the British into trouble for weapon smuggling off the coast of Ireland, igniting the American anger and bringing them into the war! but oh well, now it's sinking. A lifeboat takes out second murderer Franklin (in his POV, which is so far up his ass it's nauseating, well done) in what is meant to be horrific but I found strangely, hilariously absurd (derogatory). Murderess Dolly (The Monster) capsizes into the water, floats on a bench then sees her chance and stabs her ex boss/lover (Also a Monster) before a wave slaps her in the face and she gets caught up in the new corpse she just made and drowns in record time. Most of the cast die except for the elderly couple who sabotaged the ship (and had caused thousands to die in Mexico because of other things going on [no time]) but make a plea about how they just sabotaged things! they're not responsible when the people who told them to sabotage things in specific ways then use their sabotage to kill thousands! And Gallagher's like gee gosh I just feel bad for the old pair, how much damage do you think they can even do?!?
......a lot based on the literally 1.4k(?) that just drowned.
Long story short (too late) this was going to just be a lacklustre 2.5 stars, then all the resolutions started happening, the ending came along, the whole Chalfont-spy-? is resolved, then unresolved, then hindsight makes stupid and I honestly can't justify any higher than 1 because what was that? Genuinely, what was any of that?
Also the dead love interest felt like a dead Manic Pixie Dream Girl and maaaan I haven't seen that in a hot minute. If I had a YouTube channel, this would be a three hour rant.