When the daughter of the Swedish Ambassador disappears from her prestigious London school in broad daylight, the authorities are on high alert. There are no witnesses and no ransom demand: thirteen-year-old Freya Sjöberg has vanished into thin air.

With the Metropolitan Police out of their depth, specialist agent DS Madeleine Farrow is called in to handle the case. As a former pupil at Wimpole Girls, she knows the school's affluent corridors only too well. But even she can't anticipate the dark secrets held within its walls.

With the clock ticking since Freya's disappearance, Madeleine must return to a place that holds painful memories to find a girl who has left no trace. For help, she calls on dogged - and occasionally maverick - young private investigator Ramona Chang. Together the unlikely pair find themselves plunged into a world of extreme wealth and dangerous secrets.

The deeper they dig, the more they uncover - exposing a tangled web of conspiracy and lies that could change everything they thought they knew about the case, and each other.