Nighttime is my time

The definition of an owl had always pleased him: ""I am the owl,"" he
would whisper to himself after he had selected his prey, ""and
night-time is my time."" Jean Sheridan, a prominent historian, returns
to her hometown to attend the twenty-year reunion of Stonecroft Academy,
where she is to be honoured along with six other members of her class.
There is, however, something uneasy in the air: one woman in the group,
Alison Kenall, a beautiful, high-powered Hollywood agent, died just a
few days before, drowned in her pool during an early morning swim. She
is the fifth woman in the class whose life has come to a sudden,
mysterious end. At the award dinner, Jean does not suspect that among
the distinguished people she is greeting is the ""Owl,"" a murderer
nearing the countdown on his mission of vengeance against the Stonecroft
women who had mocked or humiliated him, with Jean his final intended
victim.