After exploring a sea chest full of runes and a journal belonging to his deceased grandfather, fifteen-year-old Sky summons the old man's ghost, who teaches him how to travel through time and space.
- ISBN10 141782655X
- ISBN13 9781417826551
- Publish Date 1 May 2007 (first published 31 July 2006)
- Publish Status Out of Stock
- Imprint Turtleback Books
- Edition Turtleback School & Library ed.
- Format Hardcover (Library Binding)
- Language English