Knock Knock (Casey Holland Mysteries, #5)

When a home invasion kills senior Elsie Englehart, security officer Casey Holland is devastated. She's supposed to be watching over elderly bus riders in an affluent, high-risk area that's been targeted by a group of thugs. Determined to keep others safe, Casey escorts an elderly man home, but an armed intruder attacks them both. Hospitalized and angry, Casey struggles to regain control of her life, despite interference from family and colleagues—and the postponement of her long-awaited wed...