Cocaine and Cormorants

Humble birdwatcher Gilbert is relaxing in his favourite bird hide when - bang - he's suddenly and unwittingly in the middle of an international drug smuggling operation. A Colombian drugs cartel have had the bright idea of training birds to fly cocaine to East Anglia. But the operation becomes difficult for them to manage when it becomes apparent the species they have chosen to fly the shipment has never been sighted in the UK before, leading to hoards of twitchers complicating the situation.