Continuing with the adventures of certified medical nurse Breanna Baylor, book three of the Angel of Mercy series follows Breanna into the mountains west of Denver. There, she becomes the prisoner of outlaws who hope to use her medical expertise to prevent the spread of scarlet fever in their slave labor camp. But when Breanna outlives her usefulness, she finds her life at risk as she hopes for survival and prays for a miracle in Captive Set Free.