On Nov. 28, 1999, a man in his mid-20s wandered into an emergency room in Toronto. His nose was broken, his wallet was missing, and he carried no identification. He claimed not to know who he was, and staff diagnosed him with post-concussive global amnesia.

“Mr. Nobody” had a slight Yorkshire accent, according to language experts, and he spoke fluent French and Italian and could read Latin. After his release he began living in Canada, changing his name and residence often.

The story ends even more strangely. In June 2001, a gay porn actor named Sean Spence claimed the mysterious man was really a French model named Georges Lecuit. Mr. Nobody was jailed and disappeared shortly after his release. Now both he and his wife have disappeared.