Carolyn Keene 
Lost Locket [EPUB ebook] 

When her best friends start fighting, Nancy must find a special locket to save the day!Nancy’s best friends, Bess and George, may never speak to each other again. It all started because Bess wanted to jump rope. She asked George to hold on to her beautiful heart-shaped locket. George put it in her book bag to keep it safe. But when she went to give it back, the locket was gone! It’s a mess of a mystery, but if Nancy Drew can find out where the locket went, she just might be able to get George and Bess to make up!