The members of covert antiterrorism unit Section 20 - Novin (Alin Sumarwata), Wyatt (Daniel MacPherson), Mac (Warren Brown) and Chetri (Varada Sethu) - are reunited by commanding officer Coltrane (Jamie Bamber) under the pretense of rescuing Dr. Helen McCluskey (Lucy Russell), a biochemist who's been taken as a hostage in Kosovo by the Albanian mafia. But as the apparent search-and-rescue escalates, a sinister conspiracy to cover up the development of the weaponized virus unfolds, and S20 must track down the stolen bioweapon before the Albanians use it for profit. The trail leads them to Venice, where mob boss Edon (Goran Bogdan) has arranged a meeting with a potential buyer. Meanwhile, Coltrane attempts to extract intelligence from Edon's driver Jovan (Tomi May) - whom he's convinced he's met before.
Written by Jack Lothian; directed by Paul Wilmshurst.