“Mad World Band” is the name of planet MWB-11 — an alternate Earth. It is wracked by war between two large power blocs that are on the verge of discovering the means of travel to extrasolar planets as well as to other alternate Earths such as Soltri.

Soltri has already experienced the nuclear catastrophe that threatens MWB-11. The Soltrians also know that MWB-11’s space explorations may well provoke fiercely hostile aliens that have already destroyed one alternate Earth.

The Soltrian agent, Dorn, must warn MWB-11 about the aliens while at the same time protecting Soltri from the warring parties of the “Mad World Band.”