Chester Keene often gets secret spy messages from his dad, who is always on covert government assignments, which is why Chester has never met him. Then, one day at lunch, Chester's classmate Skye approaches him with a clue. They've been tasked with a complex puzzle-solving mission. Chester takes their assignments very seriously, but Skye treats it like a big game. Skye proves to be a useful partner and good company, even if her haphazard, free-wheeling ways are disruptive to Chester's carefully curated schedule. As Chester and Skye get closer to their final clue, they discover the key to their spy assignment: they have to stop a heist! But cracking this code might lead to a discovery Chester never saw coming.