The Mansion at Valkyrie

Aidenn’s father is on his deathbed and tells Aidenn a puzzling story before he dies. Aidenn finds a riddle in his father’s hand, and to solve it, he and his fiancée, Charlotte, have to go to the abandoned estate at Valkyrie. But when they get there, they realize that they are not alone, and find themselves following a trail of riddles.