Department S

A chemist named Halliday disappears along with a container of nerve gas, and the Department is assigned to find him - and the container - as quickly as possible.

They soon realize they are not the only one trying to locate the man and his precious souvenir - people with sinister plans of how to use the gas are on his trail, too, and get a hold of Halliday first. Even after Jason and Stewart rescue him from the hands of the gangsters, the paranoid chemist does not trust them and disappears again, still without having revealed the whereabouts of the container to anybody. Instead, he has plans of his own - he wants to unleash the nerve gas in the middle of London...