If you were captivated by the psychological spirals and inner unraveling of Nicholas and Nakota as they obsess over the mysterious 'Funhole' in The Cipher, you'll be mesmerized by the labyrinthine descent in House of Leaves. Danielewski's novel layers the unraveling minds of his characters with an immersive, disorienting narrative, as the Navidson family explores a house that's larger on the inside than the outside—and the psychological consequences that follow.

If you appreciated the claustrophobic, small-scale focus of The Cipher, where supernatural horror seeps into the routines of daily existence, you'll find Come Closer just as unsettling. Gran’s novel follows Amanda, whose ordinary life is slowly invaded by a sinister force, making the horror feel deeply personal and unnervingly close, much like the inescapable presence of the 'Funhole' in Nicholas’s apartment.

If you were drawn to Nicholas’s ambiguous choices and the ethically murky decisions he and Nakota make, Experimental Film will pull you in. Lois Cairns, the protagonist, is a struggling film critic whose investigation into a lost film whirls her into obsession and questionable actions. Her motivations blur the line between heroism and self-destruction, echoing the moral ambiguity that makes The Cipher so compelling.

If the dark, oppressive mood of The Cipher left an impression, you’ll find a similar sense of existential dread in The Fisherman. Langan’s novel weaves grief, cosmic horror, and local legend into a story that is as somber and gritty as it is haunting. Like the pervasive sense of decay around Nicholas and Nakota, the atmosphere here lingers long after the final page.

If the mysterious, unknowable 'Funhole' in The Cipher fascinated you as a symbol of transformation and oblivion, Annihilation offers another enigmatic anomaly. VanderMeer's Area X and its shifting, inexplicable phenomena operate as both literal and symbolic mysteries, inviting you to interpret the unknown alongside the characters. The story is layered with allegory and rich symbolism, offering a similarly hypnotic and unsettling experience.