What is killing all the bees?  In 2006, beekeepers were horrified to discover that high percentages of their honeybee populations were dying out.  Here, Markle discusses the many theories about what could be killing the bees, and along the way, readers learn much about the beekeeping industry, the importance of bees in the larger ecosystem, and life inside a bee’s colony.  The informative text is laid out on large pages, accompanied by close-up photos of bees and other relevant images.  Although the presentation of the information is accessible enough for elementary school students, the complexity of the problem of the bee disappearance is plain.  Markle is a master at communicating information in a clear and engaging way.  This is an important, well-presented introduction to the problem of bee depletion – one which will educate future adults about the high stakes of this looming danger.