The Prince CommandsAndre Norton
Raised in America, Michael Karl learns at eighteen that he is heir to the throne of Morvania, a Balkan kingdom threatened by revolution and by the sinister Werewolf, a mountain marauder of more than human reputation whose followers may be less than human.
The moment he arrives in Morvania, Michael Karl is plunged into a seething plot and counterplot, and deadly danger. His death would greatly benefit some very powerful adversaries.
Michael embarks on a desperate, thrilling scheme. If it succeeds, the future of Morvania will be changed for the good.
If he fails Michael will die...
Andre Alice Norton (1912-2005) was an American science fiction and fantasy author (with some works of historical fiction and contemporary fiction) under the noms de plume Andre Norton, Andrew North and Allen Weston. Norton published her first novel in 1934, and was the first woman to receive the Gandalf Grand Master Award from the World Science Fiction Society in 1977, and won the Damon Knight Memorial Grand Master Award from the Science Fiction and Fantasy Writers of America (SFWA) association in 1983.
Andre Norton. Wikipedia.