Federal investigator Avery, who is probing her mother's disappearance, receives a wedding group photo of an event that "hasn't happened yet" and sneaks into the Vale Manor alone. In the underground treasure vault, she discovers that the groom Sebastian is a vampire who has lived for 109 years, and he harvests brides' lifespans at weddings to stay forever young. That night, she is forced to sign a blood contract marriage certificate, say "I do", and put on an emerald ring that bites into her flesh, becoming his fourth bride; if she cannot take off the ring before dawn, the marriage contract will be sealed for life. The ghosts of his three deceased wives secretly help her, and she finds that the old signature on the marriage certificate unexpectedly bears the unique handwriting style of her mother. Avery must team up with the ghost brides to turn the tables and kill this century-old hunt in the name of love before her own lifespan is drained.
