: Objects found in the house, including an old phonograph playing a rhythmic counting, act as keys to activate the cellar's true nature. The Descent

: The house was built by a scientist and occultist who used non-Euclidean geometry and "satanic math" to create a gateway to another dimension.

While the police suspect Ellie has simply run away, Keira becomes obsessed with the strange symbols and mathematical equations carved into the stone above the doorways. Her investigation reveals: