Just as a large payroll transport operation for a major company is being carried out by several employees of London's Celtic Bank, shots suddenly ring out. The man behind the wheel of the car is hit. Then everything happens in a flash and the culprits escape with a large sum of money. The chauffeur had to give his life for 6000 pounds. Scotland Yard, in the form of Inspector Varney, investigates and strongly suspects that the crooks are not professionals. Scotland Yard Inspector Varney is wrong: what initially looks like a simple routine case turns out to be a tough nut to crack. Not least because he has to deal with a great unknown who operates in the background and keeps throwing sticks between the investigator's legs. Who is this man behind the scenes?