It's Saturday night in Luton, and Bedfordshire Police are dealing with drunken domestic disputes and a booze-fuelled fight.Police Constables Leanne Turner and Andy Parsons are sent out to investigate an alleged assault against a vulnerable and fragile 75-year-old man in a domestic dispute. The suspect is the man's private carer and has been living with him for the past seven years.When he made the 999 call, the elderly man alleged that he had been slapped in the head with an open palm. But when they arrive, PCs Leanne and Andy are confronted with a distressed victim who insists he does not want them to pursue the matter and who begs them to leave.At the police station, a Polish man arrested for a drunken row with his partner is admitted into custody.He's initially brought in for a 'breach of the peace' - to remove him from the situation and allow him to sober up and cool off - but things take an unexpectedly sinister turn when he whispers to the custody sergeant that he will kill his wife the following day.