Professor T is persuaded by a former student - now a police detective - to help her investigate a serial rapist.

When a blameless librarian is poisoned at a drinks reception at the museum, Professor T is called upon to help narrow down the list of possible suspects.

Professor T becomes embroiled in a hostage situation, but his unconventional negotiating tactics do not go down well with the police.

Professor T is called upon to help investigate the disappearance of a six-year-old girl. Tensions rise between DI Paul Rabbit and Prof T until they come to blows.

Professor T befriends a vulnerable girl and is convinced she is the key witness to a murder. Dan and Lisa agree to go on a date.

When an attempt is made on a billionaire businessman's life, Professor T suspects the culprit may be much closer to home than the police suspect.