Our story revolves around Mrs. Hook's typical fourth-grade class and their class pets, Tiger and Lily, who are not ordinary goldfish. In fact, their personalities are almost too big for their fishbowl Amid goldfish daydreams, Halloween festivities, and everyday learning, the class prepares to welcome a new student into their close-knit group. Mrs. Hook; her assistant, Mr. Lyne; and Principal Sinka are concerned that the class will not accept the new student and his quirkiness. In addition to this, the school faces a mystery and is rocked by a recent string of break-ins and robberies. Throughout these escapades, the sensible Lily is the only one that keeps the easily unhinged Tiger settled. Mrs. Hook is the sole person aware of Tiger and Lily's special gift, their ability to communicate with her. The unique pets are key to solving the riddle that has befallen the school community. Will the class be welcoming of the new student? How will Tiger and Lily be instrumental in solving the mystery of the robberies? What crazy antics will the students bring to this new adventure?