Told from separate viewpoints, as evil forces from the parallel world invade their home, the Greystones, their doubles, and friends must return to the alternate dimension to save both. worlds.
| ISBN: | 9780062838438 |
| Publication date: | 6th April 2021 |
| Author: | Margaret Peterson Haddix |
| Publisher: | Katherine Tegen Books |
| Format: | Hardback |
| Pagination: | 402 pages |
| Series: | Greystone Secrets |
| Genres: |
Adventure Stories |