Sabrina invites her incredibly shy pen pal to visit from the Other Realm, only to discover a secret of hers.
The city's gun recovery program unearths a murder weapon, leading detectives to re-examine a case from 1987 that involved the accidental drive-by shooting of a little girl.
Junior attempts to fool his parents into believing he got an A for his algebra assignment, but the scheme backfires when Janet and Michael treat him like a prodigy.
Professor Payne reunites with an ex-girlfriend who tells him that they have a son. Meanwhile, Payne's dead wife comes back to haunt him.
The detectives investigate the murder of a social worker who has a history of removing children from the homes of unfit parents.