Lovejoy (1986)

Season 2: Episode 6

Ashley Wilkes travels around East Anglia painting charming pictures of country cottages and seducing their female inhabitants. An army officer hires Lovejoy to find Wilkes, on the pretext of having a commission for him, but Lovejoy smells a rat. When he finally catches up with the elusive painter, it appears that Wilkes has a terrible secret.