Two teenagers are murdered in Torrey Pines Beach, Calif., and 30 years go by with no justice for the young victims; now, the "Dark Minds" team retrace the teenagers' final hours and uncovers new clues.
A serial killer abandons the naked bodies of young women near highways outside of Denver; now, "The Dark Minds" team looks for connections and clues in the Aurora County Murders.
A cunning serial killer terrorizes California with a wave of rapes and murders, leaving a trail of bizarre clues, for investigators, it's a race against time to see if he can be found before feeling the urge to kill again.
In 1992, a serial killer cuts a swathe through the Mid-West; the victims all work in shops along the I-70 Highway; Phelps investigates the murders of six people.
Phelps investigates the unsolved murders of four couples in Virginia; four young couples at remote lover's lanes are attacked in their cars by a serial killer posing as a cop.
Phelps investigates a serial killer who positions his victims' bodies facing east; he questions if the murders of four women are related to a case on Long Island.
In 1976-77, a pedophile abducts and murders four children; Phelps wonders what kind of monster bathes, cleans and dresses his victims after killing them.
Phelps investigates the murder of eight girls over four years; a maverick private investigator, persons of interest and rumours of police corruption affect the search.