The Assassin’s Creed games have a history of appealingly wonky premises (stab templars in the Sistine Chapel!) marred by frustratingly botched play mechanics (get stuck in a bush outside the Sistine Chapel!).
The movie adaptation, unfortunately, fails to find a happy medium between cool stuff and coherence. Cherry-picking randomly from the mythology of the games, the plot follows a death-row inmate (Michael Fassbender!) forced by a scientist (Marion Cotillard?) to revisit his past life as a 15th-century superkiller. Jeremy Irons and Charlotte Rampling stop by occasionally to glower.