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Knock Knock is written by Debra Purdy Kong and published by Debra Purdy Kong. It's available with International Standard Book Number or ISBN identification 0969921187 (ISBN 10) and 9780969921189 (ISBN 13).
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 wedding. Yet another home invasion compels Casey to take action, but at what cost to her health and her relationships?