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After having been woken up by Bilbo in in The Desolation of Smaug, Smaug attacks Laketown. He is defeater by Bard, who leads the survivors to the Dale, while the dwarves who had stayed at the town rejoin Thorin, Bilbo and the other inside the Lonely Mountain. Thorin has gone mad because the gold is tainted by the dragon and because he cannot find the Arkenstone (actually found and kept hidden by Bilbo); he also refuses to help the human refugees. Meanwhile, Gandalf is saved from Dol Guldur by Galadriel, Elrond and Saruman; Sauron is sent back to Mordor. Overnight, an army of Elves appears in front of the gates of the Kingdom under the Mountain, demanding their share of its treasures. Because of Thorin's refusal to share anything, the humans side with the Elves and are about to attack when King Dain arrieves with an army of dwarves. Gandalf finally joins them, announcing that the orcs, lead by Azog are about to attack. Nobody cares to believe him until the orcs actually attack. The allies are outnumbered but Thorin is finally convinced by Bilbo to walk out of the mountain and lead the dwarves. With a few other dwarves, they attempt to bring down Azog, who is coordinating the attack from Ravenhill. They are however ambushed by Bolg, who has been leading a second army of orcs. Azog and Bolg are finally killed, but Thorin is killed as well. The orcs now being defeated, Gandalf and Bilbo travel back to the Shire.

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Following An Unexpected Journey, Bilbo and the dwarves continue their adventure, through the forest of Mirkwood; Gandalf has left them without an explanation. In the forest, the party is attacked by giant spiders, and after escaping, are captured by the Wood Elves. They soon after escape, riding empty barrels down the river. They are chased by Orcs and protected by elves, led by Legolas. The latter is set on killing Azog. Meanwhile, Gandalf visits the tombs of the Nazgûl and finds them empty. He then travers to Dol Guldur. Bilbo and the Dwarves are then smuggled into the lake town of Esgaroth by Bard, the descendant of the rulers of Dale. Thorin promises the current ruler a share of the gold in the Lonely Mountain in return for weapons and supplies. Meanwhile, Gandalf confronts the necromancer at Dol Guldur and recognizes Sauron; Gandalf is taken prisoner. Bilbo and the Dwarves reach the mountain and thanks to Bilbo manage to open the secret door. Bilbo then seeks the Arkenstone in a huge pile of treasures, but wakes up Smaug the dragon. Rekindling the forges, they attemtp to burry the dragon in molten gold, but the latter escapes and decides to go and destroy Esgaroth for having helped the Dwarves.

Wikipedia

Young Bilbo aspires to a quiet life, but he is pulled into an adventurous journey by Gandalf, along with twelve dwarves who want to retake their lost city of Erebor, now under the control of the dragon Smaug. On the way, they are captured by trolls, and saved by Bilbo's ingenuity. They then arrive to Rivendell, where Elrond helps them uncover the secret message in their map, telling them how to enter Erebor through the backdoor. In the moutnains, they fall into the trap of goblins and are made prisoner, except Bilbo who manages to escape. While Gandalf and dwarves fight the goblins in their underground city, Bilbo meets Gollum, finds/steals his precious ring, and escapes the wretched creature at the same time his companions escape the goblins. They are then chased by orcs, the leader of which is a personal ennemy of the prince of the dwarves, and saved in the nick of time by the great eagles of the elves, who take them closer to their destination.