This informational book introduces the mystery of why the little brown bats were dying in large numbers. The book continues with investigations of pesticides, climate changes and virus as possibilities. White fuzz was found to grow on the infected bats’ noses. This was determined to be a fungus. Is the fungus to blame? The little brown bats start to help themselves through this issue. Great, detailed photos accompany each page spread. Each photo is related to the information found on its page. I especially am pleased with the high number of women scientist involved in the investigation as well as in the photos. This book contains a table of contents, an author’s note, bat facts page, bat help efforts page, a glossary, an index and further research page.