Factions of Phandalin - Old Owl Well
This book goes over the various rules around the faction of the Order of the Gauntlet in Phandalin and the Forgotten Realms, making it easy for any new or veteran DMs to integrate it more into the core stories being told, and making the faction feel more useful for the players that choose to join.
In the adventure, the characters are tasked with exploring the depths of the Old Owl Well.