Moonlight becomes you - Mary Higgins Clark

At a Manhattan party, fashion photographer Maggie Holloway is reunited unexpectedly with her former stepmother. Both women are thrilled to meet again, and quickly resume their friendship. But when Maggie arrives for dinner one evening at Nuala's home, she finds her dead. And stranger still, she learns that only days before her death, Nuala had changed her will, leaving everything to Maggie… The one condition is that Maggie occasionally visit an old friend, Greta Shipley, and it is when she accompanies Greta to visit Nuala's grave that she discovers something is badly wrong. When Greta also dies suddenly, of supposedly natural causes, Maggie's suspicions are only confirmed. What Maggie doesn't realize is that she, too, has become a target for the killer, and that each clue she uncovers brings her closer to a terrifying fate.