After discovering that the lighthouse his family tends is a portal to strange and dangerous worlds, eleven-year-old Griffin must travel through it to save his father from a threat to all humanity.
- ISBN10 1534405151
- ISBN13 9781534405158
- Publish Date 1 October 2019 (first published 23 October 2018)
- Publish Status Active
- Publisher Simon & Schuster
- Imprint Atheneum Books for Young Readers
- Edition Reprint ed.
- Format Paperback (US Trade)
- Pages 272
- Language English