Ecce and Old Earth - Jack Vance

The planet Cadwal has an ecosystem unique in the human-explored galaxy. A thousand years past it was set aside as a natural preserve, protected by law and covenant against colonization and exploitation. But there is a conspiracy to open the planet and its rich resources to commerce. Glawen Clattuc must find who is behind the sabotage, and bring them to justice- but discovers that his own family is involved! Ancient crimes will be discovered, along with the key to the crisis which threatens Cadwal.

Ecce and Old Earth is part 2 of 3 of The Cadwal Chronicles.
Cadwal is a planet of extraordinary beauty. To protect it, the "Naturalist Society" has set up a Charter which allows only limited settlement on the planet in order to enforce the laws of the Conservancy. These laws forbid extensive human habitations, mining and other exploitation activities. Only six "Agents" and their staff are allowed to reside permanently on the planet: their main function is to prevent other humans from establishing residence, although tourists are allowed in specially designed lodges, overlooking sites of natural beauty and interest.

Cover art by Paul Rhoads & Howard Kistler