LOUISE PENNY says the Frieda Klein novels are ""fabulous.""

JOSEPH FINDER says they're ""in the rich vein of Kate Atkinson.""

And TAMI HOAG calls them ""truly unique.""

Now the final book in this extraordinary series is here. And it's an ending you'll never forget.

A decade ago, psychologist Frieda Klein was sucked into the orbit of Dean Reeve — a killer able to impersonate almost anyone, a man who can disappear without a trace, a psychopath obsessed with Frieda herself.

In the years since, Frieda has worked with — and sometimes against — the London police in solving their most baffling cases. But now she's in hiding, driven to isolation by Reeve. When a series of murders announces his return, Frieda must emerge from the shadows to confront her nemesis. And it's a showdown she might not survive.

Criminology student Lola Hayes has tracked Frieda down with a single-minded pursuit: she wants to delve inside the mind of a woman besieged by darkness. But in following every move Frieda makes, Lola is exposing herself to the same terrors—and the same twisted fixation of a diabolical psychopath.

This gripping cat-and-mouse thriller pits one of the most fascinating characters in contemporary fiction against an enemy like none other. Smart, sophisticated, and spellbinding, it's a novel to leave you breathless.