Episode 1 | The Machine Gun Smugglers

A yacht is tracked by police as an organised crime gang uses it to smuggle deadly weapons into Britain and a recording of a prison phone call helps jail a bank cashier for arranging to steal an elderly couple's life savings.

Episode 2 | The Cigarette Butt Murder

A discarded cigarette butt gives police the proof they need to find the murderers of a young father shot and killed in broad daylight. A used match found in a drainpipe identifies a arsonist who burnt a 400-year-old building to th...

Episode 3 | Hitmen for Hire

An airport hire car provides the clues to the identities of a pair of South African hitmen who have come to the UK to brutally murder a private investigator in his home. A rare bottle of Caribbean rum helps convict a prolific burg...

Episode 4 | The ID Fraudsters

A train ticket and a chance encounter help hunt down a pair of hi-tech international fraudsters with links to the Russian underworld. A glass milk bottle gives police the evidence that seals a case against a violent offender.

Episode 5 | The Shopping Trolley Trail

A bloodstained shopping trolley holds the key to solving the case of a vicious assault. A distinctive pair of curtains, seen on a video call thousands of miles away, helps put a phone thief behind bars.

Episode 6 | The Millionaire Drug Boss

A drug boss is put behind bars thanks to a paper trail from his dodgy property empire. A bank cashier helps convict a fraudster who's posing as a police officer, exploiting a vulnerable pensioner in a scam to extort thousands of p...

Episode 7 | The Forced Marriage

A mobile phone hidden in a bundle of clothes helps save a young woman from a forced marriage in Pakistan. A burnt tea towel helps convict members of a gang of a callous shooting.

Episode 8 | The Bank Robber Caught Red Handed

Bank notes stained with red dye hold the key to tracking down a brazen bank robber. Hidden-camera footage from a hi-tech sting operation helps snare a prolific gang of thieves.

Episode 9 | The Wet Wipe Hit and Run

A packet of wet wipes helps convict a driver responsible for a deadly hit and run. Elsewhere, a distinctive tracksuit puts a gang of ruthless thieves behind bars.

Episode 10 | The Not-So-Innocent Stabbing

A travel card holds the key to convicting a violent offender after a spate of random stabbings. A bureau de change receipt helps put a pair of thieves behind bars after they subject their victim to a terrifying ordeal.

Episode 11 | The Black Box Murder

Police have already learned of a tracker on the getaway car of two murderers, now DNA on a spent bullet casing holds the key to bringing them to justice. A hire car helps track down a thief who has stolen thousands from supermarke...

Episode 12 | The Social Media Monster

A thief who prowls for victims on social media is locked up, thanks to the sheath of his knife. His online accounts contain evidence of the violent crime spree. A plea for help scrawled on a £10 note puts two kidnappers behind bars.

Episode 13 | The Casino Blackmail

Episode 14 | The Allotment Shooting

Episode 15 | The Car Parts Conspiracy