Seekers smoke mountans

I am into the seekers seres. The first was the quest begins. I just finished the 3rd. It was about 4 bears Kalik, Ujurk, Toklo, and Lusa. they try to get to the last great wilderness, but they have to cross the big river and smoke mountains, a deadly place, the rocks are on fire. there people chase them and Lusa gets crushed by a car but survives. find out if the bears make it in one piece.