More than 12 years after he was detained by the US, Mohamedou Ould Slahi remains locked up in Guantánamo, trapped in a horrific legal limbo. But his extraordinary account, handwritten over 466 pages from his single cell at Camp Echo in 2005, is finally being published after years of litigation — and more than 2,500 redactions by the US government. In an unprecedented collaboration, the Guardian and Canongate Books present the full declassified manuscript.