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Kaz is nominally second in command of a street gang called the Dregs, though their leader Per Rollins has relaxed into letting Kaz do all the work. Kaz has assembled his own little team: Nina, a grisha (magic) heartrender who can control the human body with the power of her mind, but who is now suffering the after effects of a drug; Matthias, a Fjerdan soldier who promised to kill Nina, but fell in love with her instead; Inej, the Wraith, a light-footed, acrobatic spy who was brought to Ketterdam as a slave; Jesper, a sharpshooter whose big failing is that he's addicted to gambling. The sixth member of the team is Wylan, the son of Van Eck, the council member who doublecrossed Kaz and his team. Wylan has his own problems with dear old dad. In addition there's Kuwei Yul Bo, half their hostage, half under their protection and all trouble. Kuwei's father invented a horrific drug, jurda parem, which amplifies the talents of Grisha before killing them, and Kuwei might be the best hope for finding an antidote. The problem is that he's wanted by almost every faction in the city.
Thus the stage is set for another hectic visit to Ketterdam and, more specifically, the Barrel - the bad part of a bad place. Kaz Brekker is out for revenge and one way or another he intends to see van Eck pay for his doublecross and Pekka Rollins pay for a much deeper hurt inflicted six years earlier.
The characters are fascinating. They are a bundle of conflicting flaws. Kaz is clever, twisted and dark, ruthless and desperately trying to hide the fact that he's become fond of (and reliant upon) his gang. He's as hard as nails, but has a weakness that he keeps hidden, knowing it could kill him. Inej can scale a building or walk a high wire, but after a year imprisoned in a brothel she doesn't want to be touched. Nina is still at the stage of withdrawal that she'll beg for another dose of parem. Wylan, despite his cleverness with chemicals, can't read and believes this makes him a second class human being because it's what his father has always told him. Jesper is always driven towards risk and the next big gamble. Matthias thinks he's a traitor to his own country, which isn't too far from the truth.
The action is fast and furious with many twists and turns while Kaz and his gang try to keep ahead of the people who want them dead--which is just about everyone in the city, mercher and criminal alike. There's a satisfactory ending (no cliffhangers like Six of Crows) but enough possibilities that I hope this is not the last we see of Brekker and his Crows. Though this seems to be written for the YA market, it’s hard enough and fast enough to easily appeal across the board.