Mary Higgins Clark's He Sees You When You're Sleeping

A cutthroat stockbroker meets his maker in a bizarre golfing accident. On his way to the afterlife he learns from an angel that his less than exemplary life on earth has not earned him a ticket into heaven. He is, however, offered another chance to convince the man upstairs that he is angel material. He is charged with protecting a single mother, Annie Campbell, and her seven-year-old child from mobsters intent on stopping her from testifying against them in court. A cross between the otherworldly and a single-mom-against-the-mob courtroom drama.