This book is composed of several horror stories with a strong sense of reality:
Weird landlords, leftover items, people hiding under the bed, combing hair in the middle of the night, ghosts in the mirror, cell phone horror, strange rules, memory horror, campus horror...
Every story could have happened in the rental house where you and I lived.
After turning off the lights at night, don't look under the bed, don't look back, and don't answer the phone.