Looking for title and author for newish book, British, contemporary suspense…
Plot highlights: main character is a disturbed divorced woman obsessed with her imaginary child (male). She joins other mothers as they bring or pickup children at the beginning and end of the school day. She deflects not having a child join her at dismissal by saying he must be staying late with teacher and enters school; other mothers leave. She joins mothers in coffee shop most mornings.
This scenario repeats until she meets man at the coffee shop and they strike up a relationship. He is a con artist who befriends lonely women to debunk them and is originally drawn to our main character for this reason. They quickly form a sexual relationship but he remains a bit mysterious and leaves everyday for his ‘secret’ life, to keep pursuing other female victims, one of whom commits suicide and he plays the role of sympathetic suitor/victim to pursue the dead woman’s sister. The main character (Jane?) is suspicious and follows him misinterpreting his relationship with the mystery woman who is now blackmailing him. Main character is successful at sexually manipulating this man, however, and she convinces him they must kill the “son’s” teacher before she reveals main character’s deception…Main character suspects boyfriend of betraying her and starts to slowly poison him. After moving to another school district, Main character is recognized by former mothers group member whom she stalks and kills…