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"A cool, contemporary, whip-smart thriller." (Paula Hawkins, bestselling author of THE GIRL ON THE TRAIN and INTO THE WATER)

"A black diamond of a thriller - gleaming, sharp, deeply dark - but so much more: a cool, elegant novel with a heartbeat, a pulse, and a sting in its tail." (A. J. Finn, bestselling author of THE WOMAN IN THE WINDOW)

"Clever, clever, clever. At the black heart of this story is a personal assistant - the colleague in your office who hears and knows everything about everyone - and Renée leads us on a deeply unsettling exploration of the limits of loyalty. Believe me, chats by the photocopier will never be the same . . ." (Fiona Barton, bestselling author of THE WIDOW)

"A scintillating double psychological portrait . . . an arresting ending reminiscent of Rendell at her flintiest." (Sunday Times)

"An explosive tale of revenge that had me completely hooked." (Good Housekeeping)

The twisty, enthralling new novel from the No. 1 bestselling author of Disclaimer.

'Poised to establish herself as a big name' Telegraph

Look around you. Who holds the most power in the room? Is it the one who speaks loudest, who looks the part, who has the most money, who commands the most respect?

Or perhaps it’s someone like Christine Butcher: a meek, overlooked figure, who silently bears witness as information is shared and secrets are whispered. Someone who quietly, maybe even unwittingly, gathers together knowledge of the people she’s there to serve – the ones who don’t notice her, the ones who consider themselves to be important.

There’s a fine line between loyalty and betrayal. And when someone like Christine Butcher is pushed to their limit, she might just become the most dangerous person in the room . . .