Six of Crows
 Leigh Bardugo
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Synopsis:

Criminal prodigy Kaz Brekker has been offered wealth beyond his wildest dreams. But to claim it, he'll have to pull off a seemingly impossible heist:

Break into the notorious Ice Court
(a military stronghold that has never been breached)

Retrieve a hostage
(who could unleash magical havoc on the world)

Survive long enough to collect his reward
(and spend it)

Kaz needs a crew desperate enough to take on this suicide mission and dangerous enough to get the job done - and he knows exactly who: six of the deadliest outcasts the city has to offer. Together, they just might be unstoppable - if they don't kill each other first.