It's Spring Break at Deanville Elementary School and the gang is presented with a mysterious new riddle that will challenge their mathematics skills and senses. What is the perplexing, suspended ring that oscillates? Read The Vexing Hectare Detector to find out. Ten-year-old Jesse Steam's curiosity about how the world works leads her to one mystery after another as she pedals around town with Mr. Stubbs, her tabby cat, keeping her company in the bike basket. Using simple scientific tools and their powers of observation, Jesse and her friends analyze, test hypotheses, and conduct experiments. If the kids get stuck, they know they can count on Professor Peach, a retired science educator, to step in with a clear explanation. Jesse STEAM Mysteries promote STEM and STEAM concepts for young children.