Robert Grainier is a hardworking, compassionate laborer in the Northwest frontier during the early 1900s. Orphaned at a young age and raised by his aunt and uncle, he builds a life working in the logging and railroad industries. Though physically strong and capable, he carries deep guilt over past mistakes and faces the harsh realities of frontier life head-on.

Gladys is Robert's loving, honest, and practical wife. She possesses a keen survival instinct and often thinks faster than her husband, serving as a reliable guide for him. Despite her brutal honesty, she cares deeply for Robert and provides stability in their remote woodland life.

Kate is Robert and Gladys's infant daughter. Even at a few months old, she possesses an unsettling, almost animalistic intensity that leaves a lasting impression on her father. Her existence becomes tied to the untamed, dangerous wilderness that surrounds their remote frontier home.

Kootenai Bob is an Indigenous man from the local tribe who frequently interacts with white settlers on the frontier. He is often a source of information and local mythology, spreading rumors about wild creatures in the woods, though he faces intense prejudice from the settlers around him.

Haley is an itinerant worker who flees a dark, violent past. Mortally wounded and unable to walk, he intercepts a young Robert to confess his horrific crimes, seeking a way to unburden himself in his final hours.

Arn is an older, experienced logger who works as a powder monkey, excavating tunnels with dynamite. Having worked across the frontier, including mining in Arizona, he readily dispenses advice and tall tales to the younger crew members.

Eddie is a childhood acquaintance of Robert's who hires him for a moving job. He is somewhat impulsive and romantically ambitious, hoping to court a local widow, though his brash approach often creates friction.

Claire is a widow and former World War I nurse who hires Eddie and Robert to transport her belongings. She is independent, straightforward, and quick to defend herself against unwanted advances.

Peterson is a frontier settler who hires Robert for medical transport after a bizarre accident involving his dog and a firearm. He is deeply superstitious and terrified by the local legends surrounding feral creatures.

Billy works as a grease monkey in the logging camp and is a close friend of Arn Peeples. He works closely with the captain's young son and helps honor his fallen comrades when the harsh frontier conditions take their toll.

Harold is the 12-year-old son of the logging captain. Despite his youth, he works in the dangerous environment of the timber forests, where he narrowly avoids a deadly accident involving a team of horses.

Heinz is a local gas station owner. He harbors a deep grudge against Eddie Sauer due to Eddie's past involvement with his daughter, leading to tense interactions when they cross paths.