He Sees You When You’re Sleeping by Mary Higgins Clark & Carol Higgins Clarke
For forty-six years Sterling Brooks has been awaiting his summons into Heaven. Will he be deemed fit for entrance this year? At last the day comes and the Heavenly Council settles on a test for Sterling: he will be sent back to earth and given an opportunity to prove his worthiness by helping someone else. He finds himself in Manhattan, at the skating rink in Rockefeller Center. Among the skaters is a heartbroken seven-year-old named Marissa, separated from her father and grandmother, who have been forced into the Witness Protection Program because two mobsters have put a price on their heads. So Sterling, who can move back and forth in time and place, masterminds a plan to eliminate the threat and reunite Marissa with her loved ones...
Good secondhand condition paperback.