Crypt of the Shadowking

Crypt of the Shadowking is a fantasy novel by Mark Anthony, set in the world of the Forgotten Realms, and based on the "Dungeons & Dragons" role-playing game. It is the sixth novel in "The Harpers" series. It was published in paperback in March 1993.
Plot summary.
Harper agents try to stop the Zhentarim as they attempt to take over a city.
Reception.
Hugh M. Flick, Jr. of "Kliatt" magazine said "Crypt of the Shadowking" was "well written."