In London, Detective Sergeant Pete Rance from the Metropolitan Police's Extradition Unit leads a team serving European arrest warrants in the capital. Top of his list today is a man accused of a vicious murder back in Poland. Drug dealer Glen Madden fled the UK to hide on Amsterdam's busy streets. His photograph was circulated to a team of super-spotters in the Dutch capital. Within months the covert detectives, with a heightened ability to recognise faces, tracked him down. In Keighley, PC Tom Allen is determined to find a man accused of stealing and killing pigs back home in Hungary. And solving crime with social media - how the victim of one sexual predator used Facebook to track him down.