When a customer of William Doughty’s Bayswater chemist shop dies of strychnine poisoning after drinking medicine he dispensed, William is blamed, and the family faces ruin. William’s daughter, Frances, determines to redeem her ailing father’s reputation and save the business. She soon becomes convinced that the death was murder, but unable to persuade the police, she turns detective. Armed only with her wits, courage and determination, Frances uncovers a startling deception and solves a ten-year-old murder. There will be more deaths, and a secret in her own family will be revealed before the killer is unmasked, and Frances will find that her life has changed forever.
