After a trip to the Dominican Republic, Katie Stephens and Eddie Zytner noticed their feet starting to swell. Then their skin became covered with swirly red marks and fluid-filled blisters. The pain became so intense the couple couldn't walk. Soon, they discovered the cause of the problem—parasitic hookworms living in their flesh! Read Katie and Eddie's harrowing tale of survival, and learn all about parasitic worms and the deadly diseases they cause in this engrossing narrative nonfiction book for young readers.