The erratic course of the cruiser brought her near the lifeboat in which Kinnison and Van Buskirk were, and there the pirates attempted to stop her. The ensuing explosion was so violent that flying wreckage disabled practically the entire personnel of one of the attacking ships, which did not have time to go free--inertialess--before the crash. The two Patrolmen captured the pirate vessel and drove her toward Earth. They reached the solar system of Velantia before the Boskonians blocked them off, thus compelling them again to take to their lifeboat. They landed upon the planet Delgon, where they were rescued from a horde of Catlats by Worsel, a highly intelligent winged reptile, a native of the neighboring planet of Velantia. By means of improvements upon Velantian thought-screens the three destroyed most of the Overlords of Delgon, a sadistic race of monsters who had been preying upon the other people of the system by sheer power of mind. Worsel then accompanied the two Patrolmen to Velantia, where all the resources of the planet were devoted to the preparation of defense against the expected attack of the Boskonians. Several other of the _Brittania's_ lifeboats reached Velantia, guided by Worsel's mind working through Kinnison's mind and Lens. Kinnison intercepted a message from Helmuth, who "spoke for Boskone," and traced his communicator beam, thus getting his first line upon Boskonia's Grand Base. The pirates attacked Velantia, and six of their vessels were captured. In these six ships, manned by Velantian crews and blanketing ether and subether against the pirates' own communicators, the Patrolmen again set out toward Earth and the Prime Base of the Galactic Patrol. Then Kinnison's Bergenholm broke down. The Bergenholm, the generator of the force that neutralizes inertia--the _sine qua non_ of interstellar speed. For, while any mass in the free condition can assume an almost unlimited velocity, inert matter cannot equal even that of light--the veriest crawl, as space speeds go. Also, there is no magic, no getting of something for nothing, in the operation of a Bergenholm. It takes power, plenty of power, to run one, and whenever one goes out, the ship dependent upon it is, to all intents and purposes, anchored in space. Therefore the Patrolmen were forced to land upon Trenco--which, as almost everyone knows, is the planet upon which is produced thionite, perhaps the deadliest of all habit-forming drugs--for repairs.