Chris Coppel 
Latency [EPUB ebook] 

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…