Early morning: on the foreshore of the river Thames, a bag of bones is discovered. Human bones.

DCI Samuel Owusu quickly sends the bag for forensic examination. The bones are those of a young woman, killed by a blow to the head many years ago.

Also inside the bag is a trail of clues which lead DCI Owusu to a mansion in Chelsea where thirty years previously three people lay dead, while a baby upstairs waited for someone to pick her up.

Four deaths. An unsolved mystery. A family whose secrets can't stay buried for ever.