In the fourth part of the CarousHELL saga, Duke tries to help Robbie understand growing up isn't scary. On a father/son vacation to a cabin in the woods, Robbie finds the Nekkomeownicon and tries to speak to his late mother. But these words are instead heard by The Leviathan and its demon horde.

A young down-on-their-luck couple settle for a cheap apartment that seems too good to be true. Little do they know, something lurks in the drain of the bathtub. Something that's thousands of years old...and it is hungry.