JonBenet Ramsey’s life was short: just six-and-a-half years. But the mystery of the kindergartner’s bizarre murder in 1996 has survived for more than twice that time. Now one of the lead detectives who investigated the killing for the Boulder district attorney’s office is breaking his silence.

Former detective Jim Kolar says it has taken him months of introspection and much of his retirement savings to launch his self-published book, Foreign Faction: Who Really Kidnapped JonBenet Ramsey? The book reads like a Ramsey case encyclopedia, detailing conversations and clues that Kolar believes have been overlooked, including an intact cobweb in the basement window and a toy that may have been responsible for some of the abrasions on JonBenet’s body.

Kolar had access to 60,000 pages of evidence, including interviews, forensic reports, grand-jury records, crime-scene photos and video. He says he’s now sharing everything but the grand-jury information (which he swore an oath to keep secret) because he “wants the truth out there.”