Mary Higgins Clark - Nighttime Is My Time

Nighttime Is My Time is a suspense novel by Mary Higgins Clark, centered on a twenty-year high school reunion at Stonecroft Academy. The protagonist, historian Jean Sheridan, attends the event, but an ominous pattern surrounds her graduating class: five women from her group of friends have died under suspicious circumstances over the years, all at the hands of a vengeful former classmate. The killer, who calls himself "The Owl," targets those who once humiliated him. With only two women left from the group, Jean finds herself in mortal danger. The tension escalates when she receives an anonymous fax threatening her adult daughter, whom she gave up for adoption long ago. As Jean attempts to uncover the killer's identity, she races against time to protect herself and her daughter from a murderer bent on completing his mission.