From the introduction:
This adventure can be run as a level 4 adventure for 1 player and 1 DM, or can be easily customized to a party of any size or level. It can work as a small side adventure in an existing campaign, as a standalone one-shot, or the start of a new adventure. Use the links to the tools in their relevant section to customize the adventure to your party.
"You're in the town of Salish, which sits along a rolling plains covered in farms. The plains continue out into the lowlands, where a large volcano sits about a day's walk from the town. A large basin next to the volcano is where the lava has pooled from its eruptions, and has become lined with obsidian. Salish boasts a notable academy and delicious wine, making it a common stop for travelers."