In the middle of the night, police and paramedics are called to what they are told is a devastating car accident.

A police car executes a stop and search on a drugs courier. The cop who stops the car finds a bag with hundreds of thousands of pounds inside and seizes it as the proceeds of crime.

Patricia Coulton is found slumped in her car by a dog walker. She has been stabbed 15 times in a frenzied attack just yards from the care home in Berkshire where she works.

Officers from the Australian Federal Police could hardly believe their ears when they intercepted a call between a contact for an international drug cartel and a mystery caller.

It's August 1988 and a parcel arrives at Pedigree Petfoods, containing a tin of their dog food which has been laced with poison and a ransom note demanding £100,000.

The police are searching for Stacy Peterson. Her husband Drew Peterson is a local police sergeant. He says she's left him for another man.