The Puzzle Lady, Season 1

Bakerbury Police enlist the talents of its most famous resident, Cora Felton, AKA "The Puzzle Lady" to help solve a girl's murder.

But the eccentric Cora isn't who she claims to be: she's the fraudulent front-woman for her long-suffering niece Sherry, a puzzle genius who came to town to escape her abusive ex-husband.