Grace Rutherford is the one and only Diamond Sharp, the 'It' girl of 1920s London, whose weekly newspaper column delights readers with tales of her nightly escapades: the dinners, the dancing, the hairdos, the fashion, the men...

Caught up in the glitz and glamour of the day, Grace begins a passionate affair with charming, flirtatious American author Dexter O'Connell. Soon, though, she finds herself falling for John Cramer, the charismatic neighbour her widowed younger sister adores. Irresistably drawn to both men, Grace discovers that they are bitter enemies. As she becomes tangled up in the mesh of secrets and lies that binds them together, she must try to find out which man, if either, she can trust.