The year is 1972, the Cold War is far from over and Serena Frome, in her final year at Cambridge, is being groomed for MI5. Sent on Operation Sweet Tooth - a highly secret undercover mission - she meets Tom Haley, a promising young writer. First she loves his stories, then she begins to love the man. Can she maintain the fiction of her undercover life? And who is inventing whom? To answer these questions, Serena must abandon the first rule of espionage - trust no one.

"A web of spying, subterfuge, deceit and betrayal... Acute, witty...winningly cunning" - Sunday Times

Ian McEwan is the critically acclaimed author of eighteen novels and two short story collections. His first published work, a collection of short stories, First Love, Last Rites, won the Somerset Maugham Award. His novels include The Child in Time, which won the 1987 Whitbread Novel of the Year Award; The Cement Garden; Enduring Love; Amsterdam, which won the 1998 Booker Prize; Atonement; Saturday; On Chesil Beach; Solar; Sweet Tooth; The Children Act; Nutshell; Machines Like Me; and Lessons. Atonement, Enduring Love, The Children Act and On Chesil Beach have all been adapted for the big screen.