A ghost called Vita Frun (White Lady) is accused of several murders. Detective Hillman is contacted to resolve the case.

When private eye John Hillman is on assignment in London his wife Kajsa visits the Army's riding school at Strömsholm, Sweden. She gets involved in the strange murder of the Blue Rider. Unknown to everyone at Strömsholm.

On a tourist trip abroad the passengers on the coach witness an assassination attempt on the President Hurkas. One of the tourists has evidence against the perpetrators, and is killed when the coach reaches Sweden. Another passenger observes how one of the perpetrators is picked up by a yellow car. She is kidnapped and locked up in a mental hospital.

When a fashion show goes wrong and a model is found murdered, a private investigator and his comic sidekick must unravel the secrets of the fashion house and the suspicious cast of characters, including a stuttering sidekick and a mother-daughter duo. As the investigation unfolds, fires are set and secrets are revealed, leading to a surprising twist.

The Lady in Black is a mystery thriller set in the countryside. A mysterious woman in black haunts a manor while a private detective tries to solve a murder case. The plot thickens as the detective delves into the secrets of the manor and uncovers a web of deception, adultery, and a missing person. The story takes unexpected turns as the detective unravels the truth behind the lady in black.