Chuck and Ned deal with the shocking return of someone from their past; Emerson and Olive investigate the death of a lighthouse keeper.

J.D. tries to break-up with Danni, but she beats him to it when she realizes that she will always be second place to Elliot in his heart. Dr. Cox suddenly…

During an intimate moment, Nathan pops the question of marriage to Grace but she recoils simply because the situation didn’t fit her childhood fantasy of a proposal. When she realizes…