Life at the Flying U Ranch in the Bear Paw country of Montana was pleasant—until thousands of sheep invaded the coulee. B. M. Bower casts the ancient enmity between cattlemen and sheepmen in her own robust and slyly humorous style. Flying U Ranch brings back the Happy Family of cowboys introduced in Chip of the Flying U. Bertha Muzzy Bower, a Montanan herself, understood the joshing, boasting, and thoroughly decent young hands who worked at the Flying U—Andy, Pink, Slim, Big Medicine, Happy Jack, and the other members of the Happy Family. Here they must confront defiant sheepherders just when Chip and the Old Man are in Chicago. Bower delights in showing how they deal with rage and frustration without resorting to violence. The witty and nervy Flying U bunch gets satisfaction from a difficult situation justly ended.
Bertha Muzzy Sinclair or Sinclair-Cowan, née Muzzy (November 15, 1871 – July 23, 1940), best known by her pseudonym B. M. Bower, was an American author who wrote novels, fictional short stories, and screenplays about the American Old West. Her works, featuring cowboys and cows of the Flying U Ranch in Montana, reflected "an interest in ranch life, the use of working cowboys as main characters (even in romantic plots), the occasional appearance of eastern types for the sake of contrast, a sense of western geography as simultaneously harsh and grand, and a good deal of factual attention to such matters as cattle branding and bronc busting." She was married three times: to Clayton Bower in 1890, to Bertrand William Sinclair (also a Western author) in 1905, and to Robert Elsworth Cowan in 1921. However, she chose to publish under the name Bower.