A rookie officer who helps a drunk man get home suddenly finds himself on the front line of a murder investigation. And shoddy building work helps convict a serial fraudster.

What starts with reports of a speeding motorist ends with detectives jailing an aggressive drink driver, who ploughed into another car, killing two innocent people. And a tip-off about an illegal gun in a family home in County Durham helps police uncover a vast haul of dangerous weapons.