Dr. James Harris finds it odd to get a letter from his long lost brother Greg. Greg ran away from their small town to seek a more exciting and adventurous life when Dr. Harris was just ten. Now, after 37 years, Greg writes that he is in Spain, married, has a son and lives in an enormous villa. He has invited Dr. Harris and his family for a vacation.
While Dr. Harris and his wife, Susan, are skeptical about the identity of the writer, their kids are excited with this recent development. Young Toby thinks that this Uncle Greg has had many thrilling adventures, must be a millionaire and now lives like a king. His elder sister, Natalie is now almost sixteen and she thinks that this Greg guy is an imposter. He is trying to con them for money and must be exposed. Both however are eager to go on this ‘vacation’.
After Dr. Harris verifies that the writer is really his brother, he decides to go to Spain with the family. But at the last moment, something urgent comes up and Susan, along with the children, leaves. Dr. Harris promise to join them later.
They arrive at Uncle Greg’s villa and find it overwhelming. Located in a remote village, the villa by the lake is more like a castle. And Uncle Greg is all fun and humor while her beautiful young wife, Annabel, is extremely caring and overjoyed to see the family. Cousin Ricardo (Rick) is of Toby’s age but very shy and quiet.
But something is missing, and Toby and Natalie feel it after a couple of days. The food looks tasty but it doesn’t appease the hunger. The sparkling water and fresh fruit juice doesn’t quench the thirst. Neither Greg nor Annabel goes to the town for shopping but the kitchen is always full; in fact, everything is available in an instant, as if produced by magic.
Then there is Rick. The boy looks like a shadow. He speaks in riddles and he speaks very little, hardly comes out of his room and doesn’t go to school because of his bad health. Natalie and Toby feel like the boy is in a trance. Toby thinks that Rick wants to say something to him but never speaks his mind openly.
And then they find the crypt. It is a dark, smelly underground place across the lake. Annabel tells them that it was once a grave of Spanish warriors. Now, rats, bats and poisonous snakes live in there. She forbids the kids to enter the place. The gate of the crypt is locked anyway and nobody has the key.
But when Natalie notices someone walking to the crypt in the dead of the night, she decides to investigate. Accompanied by her reluctant younger brother, she uncovers a terrifying truth – whatever they see around them is a façade. Nothing is real – the villa, the furniture, the food – not even their cousin Rick. They also find the grave of one lady Annabel who died two hundred years ago.
As they get closer to the truth, an unknown evil forces them deeper into a horrible nightmare which they can’t escape. The evil that controls the villa and its residents want Toby, Natalie and their mother to stay there, forever. And it is waiting for Dr. Harris. The children must destroy this evil and escape with their mother and Uncle Greg before it is too late.