In the tranquil Shire, the hobbit Bilbo Baggins prepares for his eleventy-first birthday, a significant milestone that draws the attention of the entire community. He is known for his wealth and adventurous spirit, having previously journeyed to distant lands and fought in battles, which makes this occasion particularly anticipated by the local hobbits. Bilbo's preparations are extravagant; he plans a grand feast complete with music, dancing, and a variety of delicious foods, ensuring that it will be a memorable event for all.

As the day approaches, Bilbo’s excitement grows, and he becomes increasingly whimsical, planning surprises for his guests. The party day arrives, and the atmosphere is filled with joy and festivity. Hobbits from all over the Shire gather at Bag End, Bilbo's cozy hobbit-hole, to celebrate. The event features lively entertainment, and Bilbo revels in the happiness of his friends and family.

However, amid the festivities, Bilbo has a secret plan. He intends to use the occasion to announce his departure from the Shire and to disappear from the lives of his fellow hobbits, whom he feels have become somewhat dull and conventional. As the party reaches its peak, Bilbo makes a shocking announcement that he will be leaving. After delivering a speech, he dramatically vanishes from the party using the magic ring he possesses, much to the astonishment of his guests. This act of disappearance highlights Bilbo's unique character and his longing for adventure beyond the Shire.

Bilbo's sudden departure leaves the guests in a state of confusion and disbelief; many think it is just part of a trick or jest. They search for him, but he has already slipped away, returning to Bag End to pack his belongings. He reflects on his life, his adventures, and the fact that he is now ready to leave the Shire behind. He intends to travel to Rivendell, where he hopes to find peace and continue his love for stories and adventures.

After packing, Bilbo leaves a letter for his cousin and heir, Frodo Baggins, explaining his departure and the reasons behind it. He also bequeaths his possessions, including the ring, to Frodo, setting the stage for the latter's future. As Bilbo sets off into the sunset, he feels a mix of excitement and nostalgia, marking the end of one chapter of his life and the beginning of another, while unknowingly setting into motion the events that will lead to a much larger adventure involving the One Ring and the fate of Middle-earth. This chapter serves as a prologue to the epic quest that will unfold, highlighting themes of adventure, change, and the ties that bind hobbits to their homes.