Ros, Ed and Beckett's first customer appears in the form of Irene Campell, who turns out to have conned Beckett into helping her continue doing her business. Roland Blatty, a friend of Ros' who own the new Bureau of Weapons is trying to put a stop to the devices Irene sells, which have killed countless people. The team race against time to stop Irene and her legal adviser, Morasco and at the same time save Ed from a microbe that is killing him.

Ed and Beckett go 'under cover' and end up on board a submarine. They are, however, found out to be fakes and, whilst Ed escapes, Beckett is left on the submarine with a money hungry man, eager to gain access to a bank and steal some diamonds a long the way. Beckett ends up getting trapped on the submarine, as it slowly fills with water. The man, meanwhile, has got his associate to steal these diamonds, but their plan is foiled when Ros enters the scene. Ed goes under the sea to search for the submarine and but will he find Beckett in time?

An attempt to steal a revolutionary new car with an advanced guidance system is foiled by the Bugs team. The thieves then turn their attention to a millitary vehicle powered by a radioactive RTG, and Ros and Beckett have to cliumb onto the moving driverless vehicle, to stop the explosion from breaking the radioactive container and killing off most of the people in the country.

Many small companies are being bought up by two mysterious men and Ros, Ed and Beckett are called to investigate. When the manager in another company is suddenly blown up, Beckett takes his place. The two suspicious people turn out to be Jean-Daniel and his brother, Patrick. They realise that Beckett is not the real manager and Jean-Daniel goes round to ‘Gizmos' (the place where Ros, Ed and Beckett were based in Series One) Beckett ends up being kidnapped. Ed's friend, Clare, has also got mixed up in the brothers' plans, and her daughter, Katie, has been held hostage until she gives them exactly what they want. Jean-Daniel's brother is killed. Beckett and Katie manage to escape and stop Jean-Daniel's plans, and reposition the missile that stops any type of computer generated items from working, to where they are.

Cassandra and ‘Daddy' strike a deal with Jean-Daniel and Ros ends up getting kidnapped by him. Roland Blatty has a ‘brush with death' when he is left in a room filled with lots of ticking bombs. Ed and Beckett go to save Ros, and end up having to use a chain saw to free her as she was handcuffed to a steering wheel, and inside the car there was a hand grenade. Beckett spends the final scene, sawing the steering wheel, to free Ros' wrists, and Jean- Daniel returns to the Bactrian Kings tombs to retrieve the Niobian 5 that was left there.