Little brown bats do us a big favor. They eat huge numbers of insects! That helps limit the spread of diseases and the damage that insects do to farm crops. But in recent years, large populations of little brown bats have been dying off each winter. Is a virus killing them? Could climate change or pesticides be the cause? Or is it something else? Follow a team of dedicated scientists working to save the little brown bats in this real-life science mystery.

Sandra Markle is the author of numerous award-winning books for children. A former elementary science teacher, she is a nationally-known science education consultant. Markle has received many honors for her series Animal Predators, Animal Scavengers, and Animal Prey. Several titles have been named as National Science Teachers Association (NSTA)/Children's Book Council (CBC) Outstanding Science Trade Books for Students K-12, and Animal Predators was honored as a Top 10 Youth Nonfiction Series by Booklist.
Markle is also the author of the Insect World series and several single titles. Her book Rescues! was named a Best Book by the Society of School Librarians International and a Recommended Title of Outstanding Nonfiction by the National Council of Teachers of English's (NCTE) Orbis Pictus Award committee; Animal Heroes was named a 2008 Lasting Connections title by Book Links. Markle lives in Lakewood Ranch, Florida with her husband, photographer Skip Jeffery.