Sparky Christina and her saintly adopted sister Pam couldn't be more different. And when they meet similarly mismatched friends Jago and Peter, the four embark on a dazzling series of pairings and partings, outrageous coincidences and eleventh-hour entrances interrupted one disastrous Halloween when schoolboy revelry turns horribly wrong.Three years on, as Christina has made it to Oxford to study English. While she analyses the wit, cruelty and crossed genders of Shakespearean comedy, the cast of her own life reunites and the curtain falls on some gloriously unexpected partnerships.

Sisters Ellen and Lydia live out an idyllic girlhood in Oxford, their wayward adventures of no concern to their passive, donnish father and their chilly stepmother. Even when Lydia is killed in a car accident, death isn't enough to keep her from her sister, cheerfully returning to haunt her. But Ellen, unwittingly, is herself haunting the lives of those around her: there is Jonathan Goldman, whose flat Lydia is running from when she is knocked down; his daughter Stella, the 'nuisance chip'; and Stella's genius painter-boy lover Izzy....

Brilliant Australian Caroline can command everyone except her own ghoulish mother, which means that things aren't easy for Josh and Zoe, her husband with Stravinsky-glasses and twelve-year-old daughter. Zoe reads girls' ballet books and longs for lessons; a thing denied her until a chance encounter on a school French exchange.Meanwhile, on the east coast of Africa, Hattie, Josh's first love, now writes girls' ballet books - that's when she can carve out the space between her husband and her crosspatch daughter. From far and wide, they are all drawn together: a masquerade in which things are not always what they seem....