Beguinage Is Dead! by J.T. Edson

Assigned to protect Crown Prince Rudolph of Bosgravinia while he was on a hunting expedition in Texas, Ole Devil Hardin's Floating Outfit knew that their task would be anything but easy. For one thing, they were fighting two separate groups of assassins, both made up of Rudolph's countrymen. But Dusty Fog, Mark Counter, the Ysabel Kid and Waco considered that the most serious threat had been removed. Posing as a hired killer, the small Texan had brought Beguinage, Europe's top assassin, into the open and killed him ... or so they thought. Then things started to happen which made the Floating Outfit change their ideas from Beguinage being dead to the almost unthinkable "Beguinage is very much alive!"