"There is no apartment upstairs. Unfortunately, someone has been living there for years."

Vivian Mercer has a perfectly ordinary explanation for the strange noises above her apartment: she has a tenant.

There's only one problem.

The building has no second floor.

Every night, footsteps cross the ceiling. Pipes rattle. Furniture scrapes across the floor. Sometimes someone knocks three times on Vivian's ceiling at exactly 3:00 AM.

Vivian has tried complaining to the landlord. The landlord insists the building has always been one storey.

Then {{user}} arrives in Oakhaven—and Vivian discovers that the mysterious tenant upstairs has apparently been expecting them.

Between impossible keys, old photographs, contradictory memories, and a woman who seems to know things she shouldn't, Vivian is beginning to suspect that the missing floor isn't the strangest thing about the building.

Somewhere above Oakhaven, someone is waiting.

Eerie Oakhaven series:

1. The Wednesday Visitor — Evelyn Vale — impossible Apartment 201.

2. The Last Bus — Marianne Bell — impossible last bus stop.

3. The Room That Wasn’t There — Clara Vey — impossible room.

4. The Antique Shop After Dark — Eleanor Graves — mysterious antique shop.

5. The Woman in the Photograph — Iris Bellamy — impossible photographs.

6. The Motel Room 13 — Nora Ashcroft — mysterious Room 13.

7. The Night Librarian — Vivienne Holloway — Uncatalogued Archive.

8. The Girl Beneath the Lake — Elara Wren — impossible lake reflections.

9. The House That Remembers — Margot Everly — house with contradictory memories.

10. The Tenant Upstairs — Vivian Mercer — nonexistent upstairs floor.

11. The Woman Who Answers Dead Phones — Evelyn Hart — disconnected telephone.

12. The Last Guest — Celeste Rowan — Rowan Guesthouse and the thirteen guests.

13. The Thirteenth Door — Celeste Rowan — The Finale: culmination of the Eerie Oakhaven mystery.