Andrew Iden

Sex and murder are often tied together in criminal investigations; and detectives uncover dirty secrets, scandalous sex affairs, online sex addictions, jealousy and stunning twisted fantasies when looking for motives for murder.

On February 13, 2017, the senseless murders of adolescent girls Abby Williams and Libby German left the residents Delphi, Indiana shaken. Four years later, investigators are still searching for the killer using their biggest clues: a grainy picture and recording of his voice from the victim’s phone ordering the girls “Down the Hill.” Based on the blockbuster podcast, HLN investigates the evidence and clues to hunt for who killed Libby and Abby.

Heart-wrenching, personal stories of unsolved missing cases and unexplained deaths that continue to baffle investigators and horrify those left behind. Each mystery is brought to life by unravelling the evidence, compelling viewers to hunt for answers as police continue to seek the public's help.

With insight from investigative journalists and criminal experts, explores the horrific crime that claimed the lives of four college students in Moscow, Idaho.