In 1932, a crested letter draws the Belgian Detective and his loyal companion to La Ventana, a vast Uruguayan estancia where a respected household is tightening around fear: locked doors found open, bridles cut, a prized horse ridden in secret, and a weary wife convinced that footsteps pace outside her room in the night; when a thrown glass and a hidden cord device reveal that the haunting is engineered, the investigation shifts from superstition to motive, exposing a desperate plan built on love, class boundaries, and the quiet weapon of calling a woman’s terror “nerves”; Footsteps Behind the Door is an original Golden Age–style mystery about manipulation, family control, and the dangerous power of a carefully staged illusion.