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When Bilbo arrives at the Undying Lands, he believes he would never see Thorin again. What he didn't count on was a meddling wizard and another adventure that would take him to the Halls of the Dead and beyond.
The battle is over, and the lost have been counted. There is too much death, too much blood, and in the middle of it sits one small Hobbit, left quite alone but for a body on the ground and the memory of what might have been. But he is a tenacious creature, and if there is one thing that he has learnt, it is not to give up hope. In which Bilbo Baggins goes on one last journey, and doesn't come back alone.