Sally Jones is a loyal friend, a top-notch engineer, and an excellent chess player. She is also a gorilla. She never speaks, but she understands everything humans say. Together with her human friend, Chief, Sally works aboard the "Hudson Queen," a cargo ship, but her content and safe life is upended when a deal goes wrong and Chief is falsely convicted of murder. Now Sally Jones is on a mission to clear her friend's name and stop powerful forces who would do anything to keep their secrets hidden.