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 Sjoberg 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 well-heeled 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.