Casey Templeton is a fourteen-year-old boy in Alberta, Canada, who has a knack for finding dangerous problems to solve. In the first book, it was a hate cell. This time, it's a plot to rob the Royal Tyrrell Museum, a paleontology museum in Drumheller, Alberta.
Casey and his high school science class go to the Tyrrell on a field trip, including the opportunity to actually work on a dig. In the hot, hot sun, Casey leaves off his hat and takes off his tshirt, because otherwise he wouldn't get heat stroke, go to sleep in a closet and wake up to overhear a conversation between two men plotting the theft, and then wind up in the hospital briefly, then staying with the family of the museum director, whose daughter Mandy is an old friend from Casey's high school before Dr. Norman accepted the position at the Tyrrell.
It's possible I'm a bit impatient with that part of the story.