When Sarah's brother, Louis, is eaten by a Gulper, Sarah does not panic but follows the trail as the Gulper is eaten by a series of other creatures until finally she has her chance to rescue Louis from them all. Interest Level: K-3 Reading Level: 3.8 ATOS Book Level: 3.4 AR Interest Level: LG AR Points: .5 AR Quiz: 151480EN Fountas & Pinnell: K.