When Jekyll (Fredric March) realizes that he can no longer control Hyde, he breaks off his engagement to Muriel (Rose Hobart) and sets her free. As he is leaving her house, he begins to spontaneously transform into Hyde. As Hyde, he returns to the house, sneaks up on Muriel, and kisses the back of her neck. Muriel turns to kiss him back, sees his face, and starts screaming. Her father and one of the servants rush in to help her, but they are no match for Hyde. He crashes through the window out onto the terrace and beats them with his cane, causing the handle to break off. The neighbors hear the screaming and the police are called, but Hyde hightails it back to Jekyll's laboratory and locks himself inside. Meanwhile, Dr Lanyon (Holmes Herbert) has recognized that the handle of the cane as belonging to Henry Jekyll. He leads the police to Henry's house, but Henry has changed back into Jekyll. He tries to fool the police by telling them that Hyde escaped out the back door, but Lanyon fingers him. In front of everyone's eyes, Jekyll transforms into Hyde. He tries to escape, but Lanyon shoots him. As he lies dead on the floor, Hyde transforms back into Jekyll. In the final scene, the camera backs away from Jekyll, revealing a fresh pot of Jekyll-Hyde formula bubbling away.