Boy, Missing: World Book Day 2022

Cousins Ellen and Harlan have been forced to go on a family camping trip _ the worst timing ever because they're in a huge fight. So Ellen is happy when Harlan storms off into the woods, but her peace and quiet quickly turns to panic when he doesn't come back. Facing heart-stopping danger on the clifftops, will Ellen be able to find Harlan before it's too late?