Living In Perhaps by Julia Widdows
Bought this one after reading a review on Sally Zigmond's blog (she has great taste in books, so I just follow her around like a puppy...).
Really enjoyed it. Brilliantly written, cleverly drawn unreliable narrator who you know you just can't trust from one page to the next. But what I loved most was the details of sixties suburbia, so beautifully observed. The author has created a world which felt so real I was really there. Carol's adopted, feels alienated from her family, isn't sure who she is, prefers visiting the eccentric neighbours, and living in her made-up world in which she's far more important.
The ending was left hanging - up to the reader what to believe. After all, the narrator's been lying all through, so who knows what really happened?