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After Sherlock's death, John was an empty shell. He felt like he was simply existing. Until the day, a few months after Sherlock's death, that Mycroft asks something of John that John had never expected. Faced with caring for the teenaged son John didn't know Sherlock even had, John is tested beyond his wildest dreams as he is forced to learn to be a parent. Just when everything seems well and John and the boy he considers his own child have settled into a happy life, everything is turned upside down by the arrival of someone John never expected to ever see again.