Sara Almquist couldn't say no when invited to be the epidemiologist on a public health mission to assess children's health in Bolivia. Soon someone from her past in New Mexico is chasing her through the Witches' Market of La Paz and on to the silver mines of Potosí. Unfortunately, she can't trust her colleagues on the fact-finding mission, especially the sexy Xave Zack, because any one of them might be under the control of the coca industry in Bolivia. Worse still, she's not only put herself in danger, but also her sister Linda back in New Mexico.