Little Sister is the third novel in David Hewson's gripping Detective Pieter Vos series set in Amsterdam.

Her death will haunt us forever. Now the price must be paid.

Kim and Mia Timmers were just eleven years old when their family was killed. The sisters were accused of murdering the lead singer of a world-famous pop band in the Dutch fishing village of Volendam, believing him to be responsible for their family's deaths. The evidence seemed irrefutable at the time and the sisters were imprisoned in Marken, a local psychiatric institution. Now, ten years later, they are due for release.

Pieter Vos, a detective with the Amsterdam police, is given cause to re-open the case when the girls disappear along with the nurse responsible for escorting them to a halfway house. When the nurse's corpse washes up on the beach at Marken, it becomes apparent that the institution holds the key to the investigation. And it seems that Vos's boss, De Groot, has something to hide which is relevant to the case.

Then, the case takes an unexpected turn when it becomes clear that someone is posing as Little Jo - Kim and Mia's other sister - who was supposedly murdered along with their parents ten years ago . . .