A USB stick containing key information about the production and supply of illegal drugs is found in a raid of a respectable businesswoman's house. Authorities tell police that packages being posted labelled as so-called ‘legal highs' are a front for dealing narcotics online, so detectives set about finding the factory manufacturing them, before setting their sights higher. Elsewhere, after seeing an increase in guns designed to fire blanks converted into deadly weapons, police target the man responsible.

A claw hammer recovered from a bin and contaminated with the DNA of both victim and killer is the final piece of the puzzle in a complex murder investigation. When the body of a woman is found, police speak to her lodger and become increasingly suspicious of his lies and strange behaviour, including the suggestion he has been tampering with her medication. Also today, the positive identification of a burglar who photographed himself at the crime scene leads police straight to his door.