Girl Nerd (Teen Readers Level-3)

Judy's father teaches her how to work with electronics and she loves repairing stereos and CD players for her friends, but has the most fun making gadgets for spying on people. But her father tells her to be careful and warns her that one day her hobby could get her into trouble. That day comes when Judy meets Ruth Richards, a friendly police detective who becomes Judy's friend. Detective Richards asks Judy to do a favour for the police. Judy becomes a real spy. At first she is excited, but by the time the excitement turns into danger it is too late to do anything.