Why we die - Mick Herron

The road to hell is paved with all sorts of intentions, as Oxford private investigator Zo Boehm discovers when a straightforward jewelry store robbery turns out to be anything but.

When Zo Boehm agrees to track down the gang who knocked over Sweeney's jewelry shop, she's just hoping to break even in time for tax season. She certainly doesn't expect to wind up in a coffin. But she's about to become entangled with a strange collection of characters, starting with suicidal Tim Whitby, who's dedicating what's left of his life to protecting the pretty, battered Katrina Blake from her late husband's sociopathic brothers, Arkle and Trent.

Unfortunately for Zo, Arkle has a crossbow, Tim has nothing left to lose, and even Katrina has her secrets. And death, like taxes, can't be avoided forever.