Mister Mystery #16

Young heir Tad Owens inherits a Bavarian castle shrouded in dark legend, only to discover that those who enter its doors vanish—and for good reason. Beneath Castle Wisbar lies a supernatural curse passed down through centuries: an immortal brain that binds its victims to eternal servitude as the castle's keepers, trapping them until a new visitor arrives to take their place. When Tad uncovers the terrible truth hidden in the castle's depths, he finds himself face-to-face with a tormented soul who has waited three hundred years for salvation—no matter the cost.

In "Wall of Coahuila," a man driven by rage takes a deadly vow to settle a feud in the ruins of an ancient Mexican wall, where the rules of a knife duel are as rigid as the stone itself—until one man’s desperate betrayal shatters the fragile balance, leaving both trapped in a place where escape may no longer be possible.

In the dungeons of the Marquis de Vielot, the sadistic jailer Cochon subjects five prisoners—the children of a fallen duc—to a cruel starvation, gorging himself on their rations while they waste away in chains. When word comes that their execution approaches and they're granted one final meal, the prisoners devise a desperate plan to turn the jailer's own hunger and depravity against him. What unfolds is a grim tale of revenge born from unbearable desperation and the corrupting power of cruelty.