The Mystery Is Solved - S1.E20

They go to Laura's house( now that the adults are involved) and do a thourough search. They find the neclace inside the Grand Piano. When Laura had played the piano that evening, she had left the neclace on the top of the instrument. The necklace had slipped down inside of it, while the cober was open. Laura apologized profusely. Annette happy to find the necklace, allowed the incident to slide and everyone takes a go at friendship.