Baltimore: Vinnie Jones joins the Baltimore Police Department on their mission to take guns off the streets and lower the homicide rate in America's murder capital. (S1, ep 1)

Documentary examining skeletons unearthed in Ireland that appear to be treated as revenants who might return from the dead to prey on the living.

Final Lesson: The killer of a Santa Monica art teacher remains at large for years as police use every trick in their arsenal to finally hunt him down. (S8, ep 13)

Barefoot Homicide: Philadelphia investigators bring to light the obsession that drove a killer to strangle maths student Deborah Wilson to death in a computer laboratory. (S7, ep 13)

Death Comes Calling: Beloved grandparents are found murdered in their home in Oregon. Are they victims of a spree killer, or was their murder carefully plotted? (S6, ep 13)

Last Resort: A shocking culprit is revealed when police investigate a fatal acid attack on a Florida hotel manager. (S5, ep 12)

Maritime Murder: Investigators scrutinise a ship full of suspects when a naval officer is poisoned at sea. Which of the many theories surrounding his death is true? (S4, ep 13)

American Fly Boys: Suggs and WW2 militaria expert Stephen Taylor bring forgotten stories of World War II back to life by unearthing artefacts from sites across the UK. (S1, ep 8)

Bomb Factory: Suggs and Stephen are back on the hunt for more relics from World War 2, and hope searching the site of a bomb factory won't yield anything too explosive. (S1, ep 7)

D-Day Undercover: Suggs and WW2 expert Stephen uncover more historical finds across the UK, this time looking for relics of the 1944 D-Day operation. (S1, ep 6)