Ace (G-644; 1st edition) 1967 paperback. Cover by Sergio Leone, 158 pages. Condition is near-Fine: tight and square with flat spine; mild uniform age tanning (darker on insides of covers); trace of overall wear. Checkmark (in ink) at upper right corner of front cover, 1/4" line on top page block near spine - no other marks or writing.

All 4 of the "Agent of T. E. R. R. A." series appeared as written by "Larry Maddock." (Real name is Jack Own Jardine.) Hannibal Fortune was one of top half-dozen operatives of the Galactic Federation's Temporal Entropy Restructure and Repair Agency (T.E.R.R.A.) In the chess-game between the Federation and EMPIRE, he was the equivalent of a bishop or rook, and Licensed to Tamper in time. His partner was a small 15 pound symbiote named Webley who could change shape at will. [There were 3 stories featuring Webley in New Worlds in 1960 (as by Larry Maddock), but he (it?) was partnered with someone else, and no time travel was involved.]

The Emerald Elephant Gambit - Sometimes Hannibal Fortune hated his job. In the Indus valley of the 15th Century B.C., a great and beautiful civilization flourished. Now it was being invaded by a barbaric army from the west, and history said that the savages must win, that Mohenjo-daro must fall. Fortune had to fight to ensure that blood conquest - while vicious looters from the far future tampered with the balance of history.