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)

American Bombers in Suffolk: In WW2, Suffolk was home to 32 airfields that served as stations for US bombers. Suggs and Stephen hunt for relics of the visiting aircraft. (S1, ep 5)

82nd Airborne and German POWs: Suggs and Stephen go in search of relics from the United States' elite 82nd airborne infantry division. (S1, ep 4)