The program examines the disturbing behaviors of serial killers.
Each 45 minutes-long episode follows the story of an investigation guided by the killer's postmortem signature and features first-hand accounts from detectives and prosecutors who worked on the cases, interviews with criminal psychology experts and with family members and friends of the victims or the perpetrators.
[1] The show has regular participants criminal psychologists/experts, like: Katherine Ramsland, Joni E. Johnston and Mark Safarik.
Other experts are also appearing in the series for one-one episode like Michael H. Stone or Dayle Hinman.
[2] [3][4] [5] [6] The tenth episode is longer than the usual (1h 25 min) because it focuses on two separate killers.