Nick and Hank investigate a breaking-and-entering case that leads them to a mysterious family with a cultural heritage of blurring the line between right and wrong; Nick asks Monroe to safeguard Aunt Marie.
Upon learning of his destiny and that he is the last of his kind, he has to protect every living soul from the sinister storybook characters that have infiltrated the real world.
Set in present-day Portland, Oregon, the series puts a new twist on the stories of the Brothers Grimm in which a homicide detective learns that he is a descendant of a group of hunters known as “Grimms”.