The Doctor's return to Nest Cottage lands him in trouble when a key component from the TARDIS disappears. Mrs Wibbsey is inadvertently responsible, but all she can offer in recompense is a bag containing four curious objects. It seems that each one is a clue, and the beginning of a chase through time. In ancient Sussex they are apprehended by primitive tribesfolk, and mistaken for wizards. Can the revered goddess Wibbsentia get them out of hot water? Who is the fearful wizard in the neighbouring village, and why is the countryside littered with bodies?