Safe Harbour by Danielle Steel

Summary
On a wind-swept summer day in San Francisco, a solitary figure walks down the beach, a dog at her side. At eleven, Pip Mackenzie's young life has already been touched by tragedy; nine months before, a terrible accident plunged her mother Ophelie into inconsolable grief. But on this chilly July afternoon, Pip meets artist Matt Bowles, who offers to teach the girl to draw--and can't help but notice her beautiful, lonely mother.

Matt Bowles senses something magical about Pip, who reminds him of his own daughter at that age, before a bitter divorce tore his family apart and swept his children halfway across the world. At first, Ophelie is thrown off-balance by her daughter's new companion--until she realizes how much joy he is bringing into their lives. As Matt confronts unfinished business from his past, and Ophelie is struck by a stunning betrayal, out of the darkness that has shadowed them both comes an unexpected gift of hope.