Retired soldier Major John Wyatt (Brian Wilde) is spurred into action after his sister Edwina’s (Anne Ridler) home is burgled in broad daylight. Ignoring correct police procedures, he forms his own Neighbourhood Watch group of incompetents and patrols the streets in his Range Rover known locally as the ‘Dogmobile’. The Watch members are a hopeless bunch drawn together to fight crime, and bungling and personality clashes are highly evident. Brian Wilde as Major Wyatt clashes worst of all with Peter Pitt (Trevor Bannister), a smooth-talking womaniser and burglar-alarm salesman. He only has two things in mind - to flog his alarms and meet women! Other regular characters include the glamorous man-eater Virginia (April Walker), an interfering Vicar (David Jackson), and a frustrated police sergeant, Springer (James Warrior).