Tyranny of Dragons
Tyranny of Dragons is the first adventure set published by WoTC after the Starter Set's Lost Mine of Phandelver. It was in development by Kobold Press during D&D 5th Edition's development, and thus the original book releases were filled with inconsistencies and errors (that have since been ironed out) due to incomplete information about the system. The newly released Tyranny of Dragons book print has rebalanced encounters and includes the errata from the previous releases.
Tyranny of Dragons is unique amongst 5e's adventures in that you do not need any of the other books to run it. Using only the Basic Rules, the Campaign Book(s), and the Free Supplements, you have everything you need for the adventure.
The original adventure book releases were separate: Hoard of the Dragon Queen, meant for levels 1-7, and The Rise of Tiamat, for levels 8-15. In October 2019, the adventures were reprinted into a single book with an amazing art cover by Hydro74 as Tyranny of Dragons.