Jack of Diamonds (2001)

They had it all. They just got greedy. When infamous diamond thieves Jack and Cassie unwittingly target the head of a Greek underworld syndicate, they find themselves on the run from a cold-blooded hit-man. Forced to flee London, Jack and Cassie hole-up in a remote country village until the heat cools off. But things are about to get hotter. The village is a secret Government test site for an experimental hallucinogenic drug which has been introduced into the water supply with catastrophic results. Jack and Cassie join forces with a desperate band of survivors and have to run the gauntlet of psychotic villagers and armed government troops. A tense cross-country game of cat-and-mouse ensues between the crazed locals and our heroes - But who will be left standing at daybreak..?