Halley Harper, Science Girl Extraordinaire Books

Summary: Halley Harper returns to Camp Eureka, but without her best friend Gracelyn, everything feels different. Facing a new bully and an explosive chemistry show, Halley’s summer takes a turn for the worse when her diary, filled with secrets and thoughts about a hidden treasure, goes missing. With friendships on the line and secrets at risk, Halley must navigate camp challenges and find her diary before it falls into the wrong hands. Will she manage to protect her secrets and mend her friendship, or will this summer change everything?