SOLVED. Thriller mystery, Cop who lives with the daughter and agoraphobic mother [s]

[Lasher]

Mystery - Thriller When she was a child she and her little brother survived the beating and rape of their mother by mother's boyfriend. Girl saved them and then grows up to become a cop. As adult she lives with her 7 yr old daughter, agoraphobic mother and an aunt in a house left to them by a relative. Story is about killer after the female cop. She meets a lottery winner who lives on an island off the Carolina coast and helps her.

[Sue]

This is 'High Noon' by Nora Roberts. The cop specialises in hostage situations.

[Lasher]

Thanks!