She's horrified to discover that her great aunt spent her final years in squalor and mental instability, as the apartment shows that Lillian had become a hoarder after her husband's death.

Bewildered, Apryl tries to investigate the mystery behind Hessen in an attempt to learn more about her great aunt and in so doing ends up attracting the attention of supernatural powers inhabiting the apartment building.

Already depressed about his poor living situation and work prospects, Seth's interactions with the hoodie further push him into a self-destructive spiral of madness that is reflected in artwork that he creates due to Hessen's inspirations.

However his revulsion over Hessen's supernatural influence eventually takes its toll and he tries to escape, only to find that any attempt to leave the city ends with confusion and further madness, identical to what happened with Lillian.

[8] Sales for Apartment 16 have been high and the book was a bestseller in France, prompting its publisher Bragelonne to purchase the rights to two more of Nevill's work.