An American big game hunter travels to the Czarist Russia of the early 1900s, a few years before World War I, at the request of a Russian friend --there have been reports of a man-killing bear attacking people near the friend's old family estate in the Russian hinterlands. But there is more to this bear than our hero bargains for. In crafting his tale, the author draws on the Russian folklore of werebears, who have many of the characteristics of werewolves, but take ursine rather than canine form. Like Anthony Boucher's werewolves, werebears have a morally neutral shape-shifting ability, in Saberhagen's conception, and are not themselves necessarily evil --but as the villain here amply demonstrates, they certainly can be.
The story here is filled with adventure, and set against the background of the dying autocracy and the background of rising, violent revolutionary unrest; Saberhagen ties his plot into the 20th-century political history of Russia in a highly creative and original way. Throw in a romance between a gallant hero and brave heroine (there is some premarital sex in the book, but none described explicitly), and you have the ingredients of a read most genre fans will enjoy! There were a few passages where I thought the amount of time passing between one paragraph and another was indicated rather awkwardly; but in the main the author plies his craft capably, and both the Russian cultural and natural environment are brought to life well.
(I originally gave this one three stars; but thinking about it again after the passage of some time to allow perspective, I gave it four.