A lawyer, caught up in a murder case, becomes a notorious and genius con artist overnight, in order to fight against a huge conspiracy and survive.

Twin brothers Woo-sin and Soo-hyun lose their father in a murder case. Twenty-two years later, the brothers seek to clear their father's name.

Dark Minds brings together the sharp criminal minds of author and investigative journalist M. William Phelps and pre-eminent criminal profiler John Kelly to reopen unsolved homicides thought to be the work of serial killers. They are assisted in their efforts by a source known only to viewers as "13," a convict serving multiple life terms for a series of murders, who presents his theories about potential motivations behind these chilling cold cases based on his own experiences. They bring fresh eyes to unsolved serial killer investigations using the combined instincts of three unique perspectives, with hopes that it will encourage viewers to bring forward new leads.