Antique dealers Simon Peel and Oliver Smallbridge were once partners until Oliver had an affair with Simon's wife. Now they are bitter rivals - and next-door neighbours, constantly trying to sabotage each other. Oliver's daughter, riding instructress Lyn, and Simon's son David, a trainee accountant, are in love and want to marry. The two fathers hold a temporary truce to oppose the plan - until Lyn falsely claims that she is pregnant.