When Charlotte Rainsford, a retired schoolteacher, is accosted by a petty thief on a London street, the consequences ripple across the lives of acquaintances and strangers alike. A marriage unravels after an illicit love affair is revealed through an errant cell phone message; a posh yet financially strapped interior designer meets a business partner who might prove too good to be true; an old-guard historian tries to recapture his youthful vigor with an ill-conceived idea for a TV miniseries; and a middle-aged central European immigrant learns to speak English and reinvents his life with the assistance of some new friends.

Through a richly conceived and colorful cast of characters, Penelope Lively explores the powerful role of chance in people's lives and deftly illustrates how our paths can be altered irrevocably by someone we will never even meet.