 Vince is a burglar who finds himself in a difficult spot after a job and talks his old college friend Matt (who knows more than a bit about map-reading) to join him on an expedition. They both set off to walk the Roman road from Chichester to London, but it nt doesn t take long for it to become apparent that they re being chased by a mystery man in a fast car. It seems Vince has something in his backpack that someone wants very badly indeed.