Prentice Ritter, seeking an unexpected ally, enlists his estranged nephew, Tom Harte, for a journey of five hundred horses from Oregon to Wyoming. Their progress is interrupted when they encounter a man engaged in the grim business of trans…

Leaving the Cariboo behind, Print, Tom, and their companions pressed onward along the trail toward Wyoming. Unbeknownst to them, Ed Bywaters and his men pursued, driven by a desire to seize the Chinese girls in their possession.