Behind Her Eyes - Sarah Pinborough

Louise. Since her husband walked out, Louise has made her son her world, supporting them both with her part-time job. But all that changes when she meets... David. Young, successful and charming - Louise cannot believe a man like him would be attracted to her. That all comes to a grinding halt when she meets his wife... Adele. Beautiful, elegant and sweet - Louise's new friend seems perfect in every way.

As she becomes obsessed by this flawless couple she can't help but wonder are they really this perfect ? But only when Louise gets to know them both does she begin to see the cracks...