The show was created by Jim Kouf and David Greenwalt, a pair of producers from Angel Investigations. The show is based on the prototype characters and stories in Grimm's Fairy Tales, and most of the stories and characters in the show are from the characters in the book. Portland Police Department police officer Nick Burkhardt (David Giuntoli) has just been promoted to homicide detective and is preparing to make a big splash in his new job, but he begins to see some terrible scenes that cannot be explained in words. Nick's aunt Marie revealed a shocking secret to Nick, and Nick's life has changed since then. Marie said that the ancestors of the Burkhardt family once belonged to a hunter group, and their unified code name was "Grimm". There are a large number of supernatural creatures in this world, they are trying to invade the world and destroy mankind, and the mission of "Grimm" is to stop their conspiracy. As Nick learned more about his family background, he became more and more aware of his obligation to "Grimm". The Grimm brothers are fake, but the Grimm fairy tales are true-this new discovery will not only affect Nick's fate, but also the fate of mankind...