As a person who has a book on the go literally ALL THE TIME (my favorite genres are suspense/mystery/thriller), I encounter many quite good ones and many duds. Once in a while I find a gem.
The dust jacket blurb reads:
How much do we really know about those we love? When a family’s dynamic is threatened, how would we react? Written with understanding and emotional acuity, the novel is one I’ll remember for quite some time.
For more novels of this genre search the library catalogue under the subject “Psychological thriller“.