From School Library Journal
Grades 5-8--Once again, P. C. and his friend Mackenzie stumble into a murder and onto the murderer. When their nasty calculus teacher at Columbia University is pinned to the blackboard with an arrow shot from a crossbow, the two friends begin to investigate their eclectic collection of classmates. Some attend the college, but others, like Mac and P. C., are high school students taking advanced classes. A visit to a medieval weaponry collector's makeshift torture chamber, a careening taxi ride across New York City, and the final, hair-raising chase through the darkened halls of the university add excitement to this basic whodunit.