The Poison Tree by Erin Kelly

I guess this book proves to me that you can dislike the characters but still like the book.  Boy, talk about dysfunction!  The story takes place in London, and we meet Karen (our narrator) and her friends, Rex and Biba, who are brother and sister.  We know from the start that a crime has been committed but we don't know who did it or what happened.  The suspense builds throughout the book, and the ending is quite a surprise - followed by more surprises.  All the characters are quirky but the book is well-written and I had a hard time putting it down.  -June