Cahokia (KUH-HO-KEE-UH), it's a Native American word. It means simply "Truth" ... What a Thing Is ... The essence of itself." It is also a small town in Southern Illinois, where a murderer was spawned, many years ago. Chicago Police Detective Quinton Marks finds himself reluctantly tracking a serial killer to the tiny hamlet of Cahokia. And, it's the last place in the world Quinton Marks wants to be. Because, in fact, Cahokia holds many secrets to his own past and that past is a place that Marks would rather leave buried. A team of detectives are assigned to crack a cold series of murders, once and for all. The detectives are the Major Crimes Unit (MCU). The MCU doesn't get routine cases. They get the worst of the worst... The chase for a killer, thought long vanished, leads Quinton Marks and his MCU team from one fresh lead to another, inching Marks and his team closer to an ugly truth that is better off uncovered. Combing through grusome clues and pages of time, this seasoned crew drags themselves nearer one startling possibility ... the person they are chasing could be just about anyone ... Even one of them. From the mean streets of Chicago to the nothingness of old Cahokia and back, the MCU is going to solve this one, this time. He vanished once before along with any trail behind him but now Marks has vowed to bring him down ... If the real killer doesn't take out Marks and his entire crew first. Twisting and winding through past and present, Cahokia is a classic game of cat and mouse with deadly consequences that leaves bodies but very few clues behind ... Eventually leading a team of grissled detectives to wonder about their own friendships, their own loyalties and lives ... ultimately their own truths ... their own "Cahokia."