When a group of people get together and take it upon themselves to kill. It can happen for a litany of reasons. But nothing is quite the same as a group murder.

Dr. Daniel Pierce, a neuroscientist and professor, is recruited to help the federal government crack difficult cases. His intimate knowledge of human behavior and masterful understanding of the mind give him an extraordinary ability to read people, but his eccentric view of the world and less-than-stellar social skills can often interfere with his work.