Alice Winter, one of Britain's most dazzling socialites, seemingly has the perfect life - a lavish home in posh Knightsbridge, a grand estate in Devon, millions of followers on social media who eagerly await her next post.

When she disappears without a trace while on holiday with three old friends from Cambridge, her desperate husband, the real estate baron Edward Knight, turns to none other than Gabriel Allon to find her.

Gabriel soon discovers that Alice Winter is not the woman she appears to be, that she has a reckless side, that she has secrets. But Edward Knight has a secret too, a secret so dangerous that Gabriel will have no choice but to return to the life he thought he had left behind. An old enemy lurks there, waiting for him to make one misstep, waiting for the perfect moment to exact vengeance.