'The Callisto Protocol' is Epic Games Store's Dec 24 Mystery Game

Epic Games Store has revealed its December 24 Mystery Game as 'The Callisto Protocol'. The third-person survival horror game, set 300 years in the future on Jupiter's moon Callisto, features player character Jacob Lee imprisoned in Black Iron Prison. The game, Mystery Game 8 out of 17, will be available to claim for free for 24 hours.