Caput Mortum invites the player to descend into an alchemist's tower in 16th-century France to explore its mysterious depths. First-person movement through the forgotten nightmares of the building is fraught with risk, and the main actions come down to confronting horrors and revealing the secrets of forbidden knowledge. To move deeper, you must carefully study the environment to restore the picture of the events that took place in the tower and solve unique puzzles encountered at every turn.