1941
Darkness descends as the sirens begin to wail and another night's worth of bombs rain down on London. Devastation seeps from every crack of the Blitz-battered city, and in the midst of the chaos a woman grips a window ledge on the first floor of a burning Baker Street hotel. She is perched, ready to jump. And as flames rise around her, she is forced to take her chances.

1997
Alice Tremayne has lost the two great loves in her life: her husband, Michael, and her first love, music. With the anniversary of Michael's death approaching, Alice buries herself in her job as an archivist. When a newly declassified World War Two file lands on her desk, she is astonished to uncover proof that Agent 'Colette' existed - a name spoken only in whispers; an identity so secret that it has never been verified.

Her discovery leads her to MI6 'godmother' Verity Cooper - a woman with secrets of her own - and on to the streets of Paris where she will uncover a story of unimaginable choices, extraordinary courage and a love that defies even the darkest days of World War Two . . .