Errand of Mercy(1998)
(The fourth book in the Forgotten Realms : Double Diamond Triangle series)
A novel by Roger E Moore
The paladins sent by the Lord of Waterdeep to rescue his kidnapped bride have arrived in a kingdom of the Utter East. The monarch seems friendly, but the kingdom is beset by menacing fiends. Before the ruler agrees to help the knights in their quest, there is just one small task they must perform.
Used availability for Roger E Moore's Errand of Mercy
February 1998 : USA Mass Market Paperback