The myth surrounding the famous Countess Bathory of Hungary still survives, almost four centuries after her death. The film ''Eternal'' is a contemporary adaptation of this myth.

Detective Raymond Pope is on the hunt for his mysteriously missing wife. His investigation leads him to the imposing residence of the enigmatic Elizabeth Kane and the young and fearsome Irina. Beneath the air of an aristocrat from the old continent hides in Elizabeth Kane a dangerous criminal whose activities strangely resemble those perpetrated by the Countess Bathory, 400 years earlier.

In Montreal, the wife of detective Raymond Pope is killed in a sexual encounter with the mysterious and wealthy Elizabeth Kane. Pope investigates the disappearance of his wife, and finds a hint in an Internet site where she used the codename Wildcat and in her journal. When he meets the sexy and lesbian Elizabeth, his life turns upside-down and he is accused of murder. He follows and chases Elizabeth to Venice, where some dark secrets dread to be discovered.