Discovery ID

'S2/E2 - Shrewsbury Prison'. Nick and Katrina unlock the dark secrets of HMS Shrewsbury Prison in England, exploring 200 years of executions, anger and tragedy - and discovering new threats.

'S2/E4 - Shallow Grave'. Christmas will never be the same for the Oklahoma residents whose dog drops a human skull onto their porch. Police must navigate the victim's past to find the truth.

'S2/E6 - Ashes To Alibis'. In Idaho, a devoted family man, Bo Kirk, vanishes and his truck is found ablaze. Bo's sister suspects their estranged father until ATM security footage is released.

'S2/E6 - Off The Record'. Jam Master Jay, best known as Run-DMC's DJ, was killed in his recording studio. An exclusive interview with an eyewitness sheds light on this decades-old cold case.

'S4/E1 - Valentine's Day Murder'. After the strangulation of a New Jersey mother on Valentine's Day, solving the case comes down to a pair of bangles, and a chance encounter at a deli.

'S2/E2 - The Perfect Bride'. 36-year old Indle courts 18-year old Anastasia online. She travels from her home in Kyrgyztan to Seattle to marry him, but her dream soon turns into a nightmare.

'S3/E10 - The Barrel'. In the Miami suburbs, a hard-working mother from Trinidad vanishes into thin air. Detectives Danny Smith and Jonathan Zeller soon uncover her secrets.

'S4/E1 - Valentine's Day Murder'. After the strangulation of a New Jersey mother on Valentine's Day, solving the case comes down to a pair of bangles, and a chance encounter at a deli.

'S3/E5 - Gone Girls'. When three women from three different decades die or go missing under mysterious circumstances, investigators reveal they all fell in love with the same man.

'S3/E8 - Murder Among Friends'. In 1980, a teen goes for a run around her hometown in Maine. Days later, her savagely beaten body is found. Police re-examine the case when her mum intervenes.

'S1/E6 - The Blue Mustang'. In 2000, Ray Jennings was convicted of killing 18-year-old Michelle O'Keefe in a parking lot. But 11 years later, he's declared innocent. Who is guilty?

'S2/E4 - Friend Request'. Megan, a 13-year-old teenager from a small town, meets a 16-year-old boy on Myspace and falls in love. But this love story turns tragic as the web of lies unravels.

'S2/E1 - Loyalty, Lies, and Loss'. A promising young lawyer at Scott Rothstein's law firm is murdered. Investigation into Rothstein reveals a complex Ponzi scheme, duping unwary victims.

'S2/E3'. Charming Rodney Alcala hid his disturbed personality behind a photographer's lens, using his guise to lure and attract unsuspecting women into his web of murder.

'S4/E4 - .44 Magnum'. After the murder of a New Hampshire businessman at home, cold case detective Freitas outsmarts an unlikely killer who maintained a decade-long lie.

'S1/E5 - This Just In'. College student Jessica O'Grady vanishes late one night. When another woman disappears without a trace, locals wonder if a serial killer is on the loose.

'S1/E6 - I Will Find You'. In June 2002, 19-year-old Ali Kemp is found beaten and strangled to death. Her father, who discovered her body, goes on a quest to find the killer.

'S2/E4 - Men Grooming Minors'. Roo works to take down a menacing pilot interested in a 15-year-old decoy. And the team struggles to find the identity of another predator.

'S2/E5 - Meeting A Monster'. Roo and Shelby stake out a predator's hotel to take him down. The team is shocked when they learn details of the identity of 'The Gray Man'.

'S3/E7 - The Thin Blue Line'. A police officer is shot dead in a suspected set-up. Detectives take drastic measures to get answers from a tight-lipped local community.

'S3/E8 - Last Hope'. More than two decades after two women are found strangled in Philadelphia, there's renewed hope that DNA breakthroughs could unearth the brutal killer.

'S7/E1 - Casanova Con Man'. Single mother Brooklin meets a guy online. Despite many red flags, she marries him and is soon alienated from her family and close to financial ruin.

'S7/E4 - The Bride Who Will Never Be'. When Melanie marries James Addie, she believes she's found the perfect husband, unaware he leads a double life that one day will end with death.

'S1/E6 - Dead Man Talking'. When John Riebe is found dead in his home, the investigation quickly focuses on those close to him. Phone calls and voicemails prove key in cracking the case.

'S1/E3 - Hatton Garden Job'. Diamonds, jewellery, and cash are targeted by a gang of elderly London thieves, one Easter weekend, by drilling into a purpose-built vault.

'S1/E4 - World's Biggest Diamond Raid'. A criminal mastermind outwits state of the art security to steal millions of dollars' worth of diamonds from Antwerp's high security Diamond Centre.

'S1/E2 - The Twins'. After a gunfight outside a bar ends with two dead, Grand Rapids detectives discover that twin brothers are involved.

'S1/E6 - Dead Man Talking'. When John Riebe is found dead in his home, the investigation quickly focuses on those close to him. Phone calls and voicemails prove key in cracking the case.