It’s been a decade since Boonsri Angchuan and Edward Splettstoesser parted ways in California at the bloody end of her original vengeance trail. Now, she finds herself in the middle of a South American war with a new partner to tell the tale, a young Mexican woman named Lily Contreras with a dark past and more than a little blood on her own hands. And Boon’s vengeance hasn’t been doused yet—she is on a mission to find her mother, dead or alive, beginning with the one man she believes can tell her where she is. From the Chilean pampas to the high Pacific seas and the unforgiving Sonoran Desert, Boon and Lily forge a new trail against military madmen, murderous mutineers, cowboy killers, and la Guardia Rural, all of whom will taste the Vengeance of Boon.