What to read after Unit 12A-05?

Based on true events. On April 9, 2019, Zack began hearing loud noises from apartment 12-A 05 (13th floor). Each morning at 2:30 am an array of noises wakes Zack. When Zack is told by security and building management that the unit above is unoccupied, he begins to investigate. The supposedly empty apartment unit above becomes a curiosity that Zack cannot let go of. Strange occurrences and clues begin to unravel when he discovers a young child with Angelman’s syndrome and an old gardener. His investigation leads him down a path of murder and hauntings. Zack learns of several deaths, becoming obsessed with finding the truth.