In this graphic offering, a skeletal sleuth and his stuffed sidekick are on the case to catch a museum thief.At the State Natural History Museum reside Sherlock Bones, a tawny frogmouth skeleton, and his quiet companion, a taxidermic Indian ringneck parrot named Watts. One day the emergency alarm blares, and Bones quickly deduces that the museum's Royal Blue Diamond has been stolen. As Bones and Watts investigate, they find that the diamond wasn't the only pilfered property: Other blue items are also missing. With the help of new friend Grace, a chocolate-loving (and live) raccoon, the sleuths must gather clues and catch the thief before the museum is shut down and they are all sent into the dark and dusty recesses of storage. Treml's graphic mystery will most certainly delight fledgling eagle-eyed detectives who can spot cleverly placed clues (and red herrings) in the tidy panels alongside cheery heroes Bones and Watts. Interspersed throughout the narrative are fun facts covering a swath of natural science from beetles to butterflies. While Treml's art is eye-catching, the black-and-white presentation is a disappointing choice for such a visual offering that relies heavily on color to propel its plot. This quibble aside, mystery aficionados should enjoy the chance to solve the case alongside the lovable cast of animal characters.A nifty whodunit. (Graphic mystery. 7-10)