The Horus Heresy Vol.III - Visions of Treachery is the third of four art books packed with pictures based on the Horus Heresy. With text that reads like a history of the Heresy written by Alan Merrett, the book includes artwork from such artists as Adrian Smith and John Blanche, including some of John Blanche's concept sketches. Visions of Treachery details the conclusion of the Battle of Prospero, The Drop Site Massacre, and the Imperium's response to the Horus Heresy. Visions of Treachery, along with the other Hours Heresy art books were later included in The Horus Heresy: Collected Visions omnibus, and again in its re-release Visions of Heresy - War, Darkness, Treachery and Death.