Kowloon Bay by Ty Hutchinson

Her husband was brutally killed three years ago. Now he’s the prime suspect in a murder investigation. After her husband’s death in Hong Kong, FBI Agent Abby Kane moved her family to San Francisco as a way to start over. Nearly three years have passed, and now she’s returning to her homeland for a family holiday. But instead of fun-filled relaxation, Abby discovers an unthinkable secret that has her questioning the entire family she married into.