Lizzie Martin, lady's companion, has been sent from London to the New Forest to comfort a young woman whose baby has tragically died. A sad enough task, but things take an even darker turn when a rat-catcher is found murdered in the garden, and the young woman is discovered beside the body, crying and covered in blood. Not knowing where else to turn, Lizzie calls upon her friend Inspector Ben Ross from Scotland Yard to solve the horrific crime.