Dr. Keel resuscitates Elaine Bateman, the owner of a ballroom dancing school who has narrowly survived a murder attempt by gassing. When he returns to the school after dropping his scarf, he is arrested. His scarf has been used to strangle the woman.

Steed, packing for a holiday, is knocked unconscious. When he wakes, he continues to pack but is confused when Tara arrives and tells him that he has been away for three weeks. Could it have anything to do with the mysterious man following him whom everybody else but Steed can see?