4 1/2 stars for a super fun read! This is exactly the kind of suspense I love - a domestic, psychological thriller. It was fun watching "the friend" morph from your normal, everyday gal pal into someone truly disturbing. This book had a delicious slow crescendo, and I was unable to put it down as the story gathered speed in creepiness and suspense. I enjoyed all the different kinds of characters and their eccentricities. I also loved the charming English countryside setting as it provided an interesting contrast with the chilling mystery.