I recently read a book, it was a “psychological thriller”. Basically there was a guy from Ireland (calling him Shane) who had moved to England and stayed with a male friend. Shane got a girlfriend who was lost in London and he took her under his wing. They eventually went away together and on the way back, they stopped at a rest stop and he told the police she went missing while he was in the rest stop bathroom.
Shane was initially questioned as she was never found but never charged with her murder. The London flatmate eventually suggests that they put a bench out in honor of the missing girl. The girls sister shows at this event. Eventually Shane and the missing girl’s sister connect and become engaged. Once it becomes announced in the paper, odd things start to happen, including the leaving of the small inside of a Russian nesting doll all over the place for Shane and fiancee to find.
Eventually, we find that the fiancee is actually the missing girl and that her sister had actually died years ago by her abusive dad in some small, hard to get to island town.
Any idea what this book is?