Misewa saga

"Morgan and Eli, two Indigenous children forced away from their families and communities, are brought together in a foster home in Winnipeg, Manitoba. They each feel disconnected, from their culture and each other, and struggle to fit in at school and at their new home -- until they find a secret place, walled off in an unfinished attic bedroom. A portal opens to another reality, Askí, bringing them onto frozen, barren grounds, where they meet Ochek...

It's a race against time to save Eli, in this third book in the award-winning, Narnia-inspired Indigenous middle-grade fantasy series. 
After discovering a near-lifeless Eli at the base of the Great Tree, Morgan knows she doesn't have much time to save him. And it will mean asking for help — from friends old and new. Racing against the clock, and with Arik and Emily at her side, Morgan sets off to follow the trail away from...