An assassin navigates his eclectic apartment building after being hired to murder a woman whom he is infatuated with.

Blurring the lines between candid memories and narrative fiction, The Gray-Haired Men captivates as it frames the past and present as the fiction of a distant future.

Serena, a mysterious woman with a dark secret, arrives in a coastal town where men mysteriously disappear. Local journalist Dylan falls for her, unaware of her ties to deadly sirens who lure and kill. As Dylan and his brother Connor investigate the disappearances for a story, Connor's jealousy and obsession with Serena lead him to a deadly encounter. The brothers’ quest to uncover the truth places them in a perilous clash between love, betrayal, and ancient horrors lurking beneath the sea.

A man with amnesia wakes up in a wrecked hotel room next to a corpse, triggering a dangerous conspiracy. He and a maid try to recover his memories and evade the police to uncover the mystery and survive those pursuing them.