This is less (British) mystery than an organizational chart of a tripartite crime structure called Counterpol. In Counterpol, Criminal ""A"" tells Criminal ""B"" to steal for him and smuggle it out of the country, while Criminal ""C"" does the actual job. Counterpol herein attempts to get the plans for a revolutionary new car motor but also gets involved in a diamond theft plus a clutch of murders. Everyone fails at everything, but Counterpol will go on in this new series which is satisfactory.