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Up until now, the only monsters the LAPD had ever seen were of the human variety... When two down-on-their-luck detectives are forced to work together on a series of cold cases, they slowly begin to uncover a common thread that may hold the key to solving some of their town's grizzliest unsolved murders. Little do they know that the same key will unlock secrets from a different dimension; one filled with monstrous creatures that should never be disturbed...