When his handler, Kyle Wincott (Robbie Amell) is killed while on duty in Afghanistan, military working dog Max is traumatized and retired. He’s adopted by Kyle's parents (Lauren Graham, Thomas Haden Church) and slowly, Kyle's little brother Justin (Josh Wiggins) comes to care for troubled dog.

At first, Max wants nothing to do with Justin or anything else, but Justin perseveres with a little help from his friends and tries to help Max overcome his post-traumatic stress disorder. As they start to trust each other, it turns out Max may have witnessed what really happened to his brother that day on the front, and Justin is determined to solve the mystery, even if it puts him in danger.