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Erebor holds a masquerade ball. Another thinly veiled attempt by Dis to get him to find his One. Despite her good intentions, Thorin sees this as a pointless endeavor. He has no One. Little does he know that things have been put in motion far beyond his understanding that may lead to this being the most memorable masquerade ball of his life.
In a Middle Earth where dwarves dream of Heartsongs and hobbits carry the name of their fated partner as private Mark, Bilbo Baggins had never been able to properly translate the strange rows of runes inscribed on his wrist. And likewise, Thorin Oakenshield had never imagined he would hear the voice of his Heartsong from a fussy little gentlehobbit.
In which the Company are entirely too nosy about matters that are supposed to be a secret, and Bilbo learns that being concerned about propriety is overrated when you could be making friends instead.
Dwarves are born with a bone-deep knowledge of their One, but Thorin stops feeling the pull of his after the dragon attacks Erebor. Needless to say, he is surprised, and not initially pleased, to find his One living behind a round green door decades later.
Hobbits find a seed that represents their innermost self and can offer it to someone else to plant. This creates a bond as strong as deep roots in the earth between them. It is just like Bilbo, after years of thinking that no one would want his, to offer his soul-seed to a dwarf that does not understand gardening metaphors.
But just because they have found each other does not make the quest to reclaim Erebor any easier, and in the end a sacrifice is still made.
Thorin has to trust in the strength of the bond between himself and his One, because otherwise he will never believe that the sacrifice was worth it.
Bilbo Baggins was not a particularly talented Guide. He knew that. His family knew that. Every last Hobbit in the four Farthings and Bree knew that. But that meant nothing when one morning an agony that wasn’t Bilbo’s ripped right through him, dropping him to his knees with a scream. Wrapped up in the pain there was a presence. Someone fierce and determined, nestling himself in the blank space in Bilbo’s mind for the barest of moments before he slipped away. It was like fingertips brushing across the outside fringe of his soul, and Bilbo wanted it back. Wanted him back. And so help him, Bilbo was going to find him. His Sentinel.
In which nearly all beings on Middle Earth have soul marks. When and how dwarves and hobbits receive them is a bit different; misunderstandings follow. Bilbo Baggins is entirely sure he doesn't have a soul mark yet but Thorin Oakenshield knows different - he isn't much help when it comes to informing the hobbit because he's got a soul mark of his own.