The Doctor answers a psionic distress call being sent from England in the 1920s. There, in the environs of a fairground, he is reunited with an old friend: Harry Houdini. To Adric and Nyssa the name means very little, but to the Doctor's companion, Tegan, he is a legend. An escape artist extraordinaire, Houdini's reputation will last for decades. But how does Harry knows so much about Tegan?