STOP THE CLOCK

JUST AS NANCY'S GEARING UP THE HELP PLAN THE MAHONEY LIBRARY'S SEVENTY-FIFTH ANNIVERSARY CELEBRATION, THE BEAUTIFUL OLD CLOCK IN THE LIBRARY IS STOLEN. SOON NANCY LEARNS THAT IT IS ACTUALLY WHAT'S INSIDE THE CLOCK THAT IS MORE VALUABLE THAN THE CLOCK ITSELF. CAN SHE CATCH THE THIEF BEFORE THE CLOCK STOPS FOR GOOD?