Events in the ‘Derailleur Code’ have now taken a more sinister turn and may even become moderately exciting. The 'civilised' world's arch opponent Der Bromptonaut has created chaos throughout Western Sweden. His weapon? What to any normal person would look just like an ordinary bike hub is in fact an extremely volatile prototype of a new form of bike propulsion. The original of this design was stolen from the M7 Human and Alternative Powered Vehicle Company near Amsterdam many chapters ago. Since then Der Bromptonaut has managed to make copies of the design. The M7 AM10 36 spoke hub has to be kept moving in order to avoid going critical. One that was 'gifted' by Der Bromptonaut to the Bikea Store in arberg has since exploded violently causing a total black out and showering a large part of western Sweden with cut price bike parts.

In response the government in Stockholm has ordered a state of emergency with all routes in and out of the region blocked. The Swiss Bike Patrol's special train cannot move without power. Doctor Moeller, Captain Tobler, Detective Wallender and advisor Herr Braun remain on the train. A detachment of four Swiss Bike Patrol officers make a sortie but have found themselves boxed in by Swedish security forces. Professor Dawes and the ever-resourceful Lucyna pursue their enemy by breaking through much of the military cordon by using the state-of-the-art M7 Ultratandem Velomobile on the main railway line. Unfortunately this plan has now failed. Both Dawes and Lucyna are now being held separately in Falkenberg by the Swedish Police who are unaware of the danger posed by Der Bromptonaut and dismissive of the whole story. During intensive questioning Dawes is given reason to question Lucyna's whole role in the affair. Has he got involved in something that he doesn't fully understand? Kilometres away on the immobilised Swiss Bike Patrol train Doctor Moeller, Detective Wallender and the often silent Her Braun have just sent for help using a satellite phone powered by a bike dynamo. Herr Braun keeps checking his watch to see whether another whole chapter will pass in darkness or whether the story will ever emerge into daylight.