There are some crimes that stay with you forever. Not because of their gruesome nature, their high body counts or their despicable perpetrators, but because, despite all the efforts of investigators, they remain unsolved. Packed with crime scene photos, maps of killers’ hunting grounds and suspicious suspects, the world’s most notorious unsolved crimes are featured within these pages. Featuring: The most notorious unsolved crimes - Inside the investigations of the most shocking crimes. The Zodiac killer - The media-courting madman who escaped justice. Madeleine McCann - The most sensational child abduction case. In-depth insights - Interviews with investigators, crime scene photos, detailed illustrations and more.