Gunnel Broström

När privatdetektiven John Hillman är på uppdrag i London besöker hans fru Kajsa arméns ridskola på Strömsholm i Sverige. Hon dras in i det märkliga mordet på den blå ryttaren. Ovetande för alla på Strömsholm.

After having spent six years in an asylum, Harry returns home. He soon remembers what happened six years ago. He had five of his friends over and one of them, Raoul, was murdered. In order to find out which of them is the murderer, he invites them over to reconstruct the crime.