Polidori left Switzerland for Italy in September 1816, where he traveled for nearly a year, returning to England the following spring, at which point he sought to practice medicine in Norwich. But he was unhappy in his profession and thought, instead, of turning to law. In the meantime, perhaps as his own response to the heady literary summer he had passed on the continent, he began a short, but productive literary career. His first work was an extension of his interest in psychology, An essay on the source of positive pleasure (1818). The following year came a volume of poems -- Ximenes, the wreath: and other poems -- the novel Ernestus Berchtold, and the short story, "The Vampyre," which, unfortunately, was passed off as the production of Lord Byron when it was published in the New Monthly Magazine. When he found the work being published under a separate imprint, Polidori went to some lengths to claim the work as his own, but the scandal of imposture dogged him thereafter. His final work, Sketches Illustrative of the Manners and Costumes of France, Switzerland, and Italy, was published in 1821 under the pseudonym of Richard Bridgens. That August, purportedly as the result of contracting a gambling debt he could not honor, he committed suicide by drinking prussic acid. He was 25 years old.