一位女演员被发现在一具尸体的旁边,而她又失去了记忆,似乎没有什么能说明她不是凶手。就在法院认定她有罪并被判处死刑的时候,依然有一个人相信她是无辜的,但他能够找出足够的证据解救她吗?The police find the actress, Diana Baring, near the body of her friend. All the circumstantial proofs seems to point to her and, at the end of the trial, she is condemned. Sir John Menier, a jury member, suspects Diana's boyfriend, who works as an acrobat wearing a dresses.