The Seventh Sacrament

Back in Rome, Detectives Costa, Peroni, and Leo Falcone are trying to move on from their recent escapades in Venice. Their lives take a turn when they discover bloodstains on a missing boy's T-shirt connected to a museum exhibit about communication with souls in Purgatory. As they investigate, they uncover a mystery intertwined with the ancient cult of Mithras and the eerie House of Bones.