Carolyn MacKenzie was 16 years old when her older brother Charles, known as Mack, disappeared just before his college graduation. A decade later, dissatisfied with the police’s efforts to find Mack, Carolyn decides to undertake her own investigation. Clinging to the belief that Mack is alive, based on his annual calls to their mother on Mother’s Day, Carolyn begins to interview anyone she can find who had a connection with her brother. The more she learns, the more questions arise, and the more she unknowingly jeopardizes her own safety. Where Are You Now?, Mary Higgins Clark’s twenty-seventh suspense novel, incorporates all the elements Higgins Clark fans have come to expect: numerous characters who are rarely whom they appear to be, fast-paced chapters with cliffhanger endings, and plot twists that’ll keep the reader guessing.