Secret lives

At seventy-five years old, Ethel Fiona Crestwater is used to being underestimated. She looks like someone's grandma, although she's never married or had children; petite and a bit frail, she's not a threat to anyone. Or is she ...? Ethel runs a boarding house for government agents, and when someone murders one of her boarders, she springs into action, much to the surprise of her distant cousin Jesse, who has recently come to stay with her while h...