This line is the title of an episode of the genealogy TV series “Who Do You Think You Are?” that features actor Kim Cattrall.

Kim Cattrall and the show

• Kim Cattrall, best known for playing Samantha Jones on “Sex and the City,” appears in an episode of the BBC’s “Who Do You Think You Are?” where she investigates her family history.

• In that episode, she explores the long-standing mystery of her maternal grandfather, who disappeared from the family when her mother was a child.

The episode’s focus

• The program follows Cattrall as she traces records and relatives in the UK to learn what happened to her grandfather and whether he started a second family.

• Her journey is framed as both a personal search for identity and a way to bring closure to her mother and aunts after decades of unanswered questions.