Introducing John Coltrane, Bob Felston and Sarah Palmer, members of a Customs Investigation team in this, their first field operation together. A bungled joint operation between No 6 Regional Crime Squad and Customs leaves a large consignment of drugs at large in the UK. A splinter group from the smuggling gang decides to start their own business with the proceeds. But their plans are uncovered bit by bit by the Customs Investigators and form the beginning of a Europe-wide operation to track them down. Then, just when the Customs are ready to take them out, it all goes disastrously wrong - for everybody.