From the introduction:
Initiation: The tests and trials complete, only one more step remains.
This adventure is the first follow-up to Chapter 2 - A Lesson in Loyalty.
While it is possible to adapt the adventure without using Chapter 1 or 2, there are characters that are introduced in Chapter 1 and 2 that will need to be referenced. Characters can be of any experience level, but is best used with new and inexperienced PCs.
Set in The World of Thorin