One last case, and the stakes have never been higher...

Caelan Small is leading a quiet life, lying low and off the force until her old boss calls. A woman is in trouble, threatened with kidnap or worse.

Back in the Met, she goes undercover with the vicious dealer Mulligan, entering a dark underworld of drugs, scammers and thieves. Nobody can be trusted.

As Caelan gets drawn into the investigation, she starts to uncover a shocking trade in human flesh. Tensions reach boiling point and the search becomes increasingly desperate.

But something is wrong. Information, their most priceless asset, is leaking. If Caelan isn't careful, she won't survive.