***Special anniversary edition, with a new introduction by A. J. Finn***

Someone's watching you. You don't know who. But he knows you . . .

Zoe, Jennifer and Nadia are three women with nothing in common. Except for the man who wants to kill them. He sends them terrifying letters - promising to bring their lives to a violent, horrible end. But not before he has enjoyed himself.

He delights in watching the women suffer, thrilled by his power to leave them utterly helpless, alone and in terror. Except they're not all as helpless as he thinks . . .

'Nicci French represent psychological suspense at its most searching and incisive' A. J. Finn, internationally No. 1 Bestselling Author of The Woman In The Window