Peter Davison, Janet Fielding and Sarah Sutton reprise their roles as The Doctor, Tegan and Nyssa, in a run of stories following on from 1983's adventure The Arc of Infinity: Today should be much like every other day for Hargreaves, the computer consciousness that co-ordinates daily life aboard the spaceship...
It was meant to be a harmless stag night prank. A few hours later four of his best friends are dead and Michael Harrison has disappeared. With only three days to the wedding, Detective Superintendent Grace - a man haunted by the shadow of his own missing wife - is contacted by Michael's beautiful, distraught fiancée, Ashley Harper. Grace discovers that the one man who ought to know Michael Harrison's whereabouts...