User blog comment:Hyperborean/The Heroes of Olympus: The Demigod Diaries/@comment-99.244.107.179-20111127235656/@comment-3146930-20120116203143

The story about Hermes and the fire giant takes place between The Last Olympian and some time before Percy vanishes in December, and will be written in the style of the Percy Jackson series. The Thalia/Luke story takes place when they are trying to get to camp, so this will be an older story, and the last one takes place while the camp was buidling the Argo II, so between The Lost Hero and The Son of Neptune.