Hannah Moore conceals her true identity to accept a job as a caretaker-in-training at Chateau Beaumont, a foster home funded by the mysterious Lafayette Foundation. When former resident Izzy Rodriguez returns home for summer break, they find themselves drawn to each other and immersed in a deadly mystery.

Meanwhile, former foster Bianca Evans joins forces with a local filmmaker to investigate the disappearance of her twin brother after he was sent to Chateau Beaumont a decade before. It’s a race against time as Hannah seeks a world-ending threat in the depths of Lake Ontario before Bianca or Izzy uncover the truth.