Millie and Cogs (aka the Blueberry Detective Team) are headed to the library to return a book. However, the Seaside Library is closed because they had a break-in last night! Eight library books were taken and the library was left a mess! But no need to worry. The Blueberry Detective Team is on the case. Help them discover the clues that lead them to the book thief. Not only do they find the missing books, they help clean up the mess in the library and learn some nifty science facts about...shhhh...the thief! The Millie Blueberry Mystery books are a contagious series for emergent readers that combines teamwork, mystery and science.