After emerging as a potent force in the genre with Horror of Dracula, Hammer Films added their handsome Gothic touch to this lesser-known remake of the 1944 suspenser The Man in Half Moon Street (itself adapted from a play by Barre Lyndon). Anton Diffring stars as a century-old artist who maintains a youthful appearance by regularly replacing certain glands -- in transplants that he receives thanks to the unwilling participation of healthy donors. Despite his outward physical vitality, his advanced years lead to an increasing mental instability, evinced by his mad obsession with an old flame (Hazel Court) whose newfound love for a suave doctor (Christopher Lee) compels Diffring to commit acts of diabolical cruelty that ultimately become his grisly undoing. Directed by Hammer regular Terence Fisher, who applies a high polish to this atmospheric period thriller.~ Cavett Binion, All Movie Guide