Medusa : tiger by the tail: book four of the four lords of the diamond

The Confederacy's best operator is assigned to take over the mind of an assassin on the planet Medusa and overthrow the dictator, Lord Talant Ypsir The Confederacy's grand scheme seemed to be working. They had substituted the mind of their best operator for the minds of four criminals - every one a top assassin - and sent one to each of the four Warden worlds to eliminate the resident Lord there. The agents on Lilith, Cerberus, and Charon had already reported in - success! Now only Taran Bul's mission on Medusa remained. On this frozen ice world, Bul quickly joined an on-going conspiracy determined to overthrow the hated dictator Lord Talant Ypsir - the rebel's mission suited his perfectly. But a combination of alien menace and Ypsir's secret power proved too much for Bul. At last, the operator over all - the Agent With No Name - had to prove his ability...with everything stacked against him! In this volume of his most gripping series, Jack Chalker brings to a grand conclusion the epic confrontation between the mighty confederacy and the small but powerful worlds of the Warden Diamond.