Beasts of Jötunheimr (The Army of One) by Baptiste Pinson Wu

Lost in the wilderness of Jötunheimr, the realm of their mortal enemies, Drake and his two companions struggle against beasts and the elements to find a path back to Asgard. But surviving packs of giant wolves, blizzards, and hunger is just the first of their priorities. They must warn their brethren of the terrible truth; Loki is back, and his plan is in motion. Ragnarök is at Valhöll's doorstep, and none of them has realized it. When duty fails to motivate Drake’s next painful step, his thirst for revenge takes over, filling his chest with the fire of hate and his mind with the vision of the traitors whose blood will spill by his hands. If they can make it out of Ironwood.