The Villain's Daughter by Roberta Kray
Small-time villain Sean O'Donnell walked out on his family almost twenty years ago and hasn't been heard of since. Now his daughter, Iris, has returned to the East End to find out just what happened. But it isn't going to be easy. Everyone close to Iris seems to be keeping secrets.
When the mysterious Guy Wilder offers to help Iris uncover the truth, he changes everything. As the son of the local criminal matriarch, though, Guy has plenty of problems of his own . . .