The Case of the Toxic River by Cindy Cipriano

Grace Brooks is a total and unashamed nerd. She loves her life, her friends, and her little dog Neutrino. That is until one day she’s uprooted to Miller’s Island, North Carolina, to start over as the new kid in school. There she meets Jack, and they quickly bond over their love of science and all things nerdy. Together they embark on an epic adventure, travelling through time to solve the mystery of The Toxic River.