When Margaret is disappointed that no one but Todd can attend her family Thanksgiving dinner, Todd tries to convince his brother to come home; Margaret's family inadvertently helps her crack a case involving an injured bank teller and robbery.
Two new officers relive their school days when they tackle their first assignment, a drug case in a local high school.
Panic ensues after Archie and the gang learn that Mrs. Thornton is accused of being a Communist; Cheryl's father forces her to out gay students at Riverdale High or risk losing power over the Vixens.