First published 2016
The Walker kids thought their book world adventures were over. But when a giant friend is in trouble and mystical creatures start appearing across America, it's clear the worlds are colliding. Now the Walkers must track down three hidden Worldkeepers to seal the realms for good. But with lethal outlaws, killer robots, and the Wind Witch herself standing in their way, they'll face their toughest choices yet. Who can they trust when everyone is hiding something?
Genres: science-fiction, adventure, fantasy, young-adult
Vibes: fast-paced, suspenseful, thought-provoking
Tropes: chosen-one, found-family, portal-fantasy
Setting: San Francisco
Period: 21st Century
560 pages · Hardcover · HARPER COLLINS