This "evocative and beautiful" (School Library Journal) novel "vividly imagines the lives of three girls" (Booklist, starred review) in three different time periods as they grow up to become groundbreaking scientists.

Maria Merian was sure that caterpillars were not wicked things born from mud, as most people of her time believed. Through careful observation she discovered the truth about metamorphosis and documented her findings in gorgeous paintings of the life cycles of insects.

More than a century later, Mary Anning helped her father collect stone sea creatures from...