All six kids are suspects when the FETCH! Grand Prize is stolen from the grounds of Dogwart's, Ruff's old obedience school. Working with forensic scientists, the kids must collect and analyze evidence in order to clear their own names and find the real culprit. In doing so, they learn about the physical characteristics that some humans share (such as shoe size, and hair color) and the characteristics that are unique to individuals (such as DNA and fingerprints). Boston Police officers and forensic scientists work with kids throughout the evidence collection process, by identifying stray hairs, lifting fingerprints found at the scene, and investigating footprints and DNA.