Antoine Breguet is an old watchmaker who wants to retire. One of his two apprentices is going to take his place, but which one? Who is better qualified and who will impress the watchmaker’s granddaughter more? The two men are ready to compete. Whoever comes up with the best, most exquisite and intricate creation will inherit Breguet's shop. However friendship and love stand in the way. What will happen with the two friends and their future as watchmakers? Find out in Lydia Child’s "The Rival Mechanicians".