Dark Shadows - Season 3 Episode 50 DS-242 Necking in the afternoon.
Overview: Dr. Woodard is puzzled by what he finds in samples of Maggie's blood. Roger suspects Elizabeth is paying money to Jason because he has something on her. Elizabeth tells Jason she cannot give him any more money as it is starting to attract attention; Jason agrees. Someone breaks into Dr. Woodard's office and steals the samples of Maggie's blood.