Ghostheart by R.J. Ellory

Annie O’Neill has it all – a cosy Manhattan apartment, a beautiful bookshop and a network of supportive friends. But at the heart of her life is a hole – a place vacated by her father when he died in her childhood. So when a mysterious man named Forrester enters the shop and claims to be her father’s oldest friend she jumps at the chance to find out more of her own past. But he’s not being free with the answers she needs. He’s much more interested in telling her a story about a ruthless ganglord and a fifty year old betrayal. A betrayal that she will realise far too slowly, has something very much to do with her…