Suzanne Collins' "Sunrise on the Reaping" is full of Easter eggs for the whole "Hunger Games" series, particularly "Catching Fire."

Sunrise on the Reaping,’ the second ‘Hunger Games’ prequel, has major connections to Katniss Everdeen’s trilogy

In the very first chapter, you’re introduced to two of Haymitch’s friends from District 12: Burdock and Asterid. They don’t play huge roles in the story of the book but die-hard Hunger Games fans will likely piece together that they are the eventual parents of Katniss Everdeen.