Judy, an enthusiastic third-grader with big plans for the ultimate summer, is determined to have the most thrilling vacation ever. She creates a "Thrill Points" system with her best friends, where they earn points by completing exciting and daring activities. However, Judy faces a setback when she learns that two of her best friends will be traveling out of town, leaving her at home. To make matters worse, her parents are also going away, and her Aunt Opal, an eccentric and quirky former circus performer, comes to stay and look after Judy and her younger brother, Stink. Judy is initially disappointed but eventually starts to see Aunt Opal’s adventurous spirit as a potential ally in her quest for fun.

As the summer progresses, Judy embarks on several wild escapades with Aunt Opal and Stink, trying to rack up Thrill Points and prove that her summer can be just as exciting as her friends'. Their adventures range from hunting for Bigfoot to participating in a local circus show. Along the way, Judy learns the importance of family, creativity, and embracing the unexpected. Despite facing challenges and hiccups in her plans, Judy discovers that her summer can be memorable, even if it doesn't go exactly as she envisioned.