In the second-season premiere, when a university student is left badly burned and in a coma after a house fire, detectives reluctantly call in the professor when it emerges that the victim was drugged and the fire was deliberate.

A prominent barrister and his wife are found shot dead in a crime that has uncanny similarities to a double murder that the barrister successfully prosecuted 15 years earlier.

The Professor is asked to decipher a macabre puzzle when a doctor and her family are found dead in a grisly tableau on their living room sofa, each having died by different means. But in which order and by whom?

When an artisan baker is found dead after receiving death threats, the police appear to have an open and shut case against the son of a convicted murderer who was sent to prison thanks to the baker's testimony.

After discovering the body of an undercover police officer, the CID team blunder into a Drugs Squad operation against a major trafficker that appears to implicate one of their closest colleagues.