In the seventh Volume, The War for Phang, Sophie's home, the comet Phang, is the central setting. The family deals with the addition of Petrichor to the reunited family, and Alana's second pregnancy.
The eighth Volume, The Coffin, finds the family dealing with the effects of Alana's miscarriage after the events on Phang. Vaughan stated in an interview that Petrichor would continue to play an important role in Hazel's development, and that what has happened to The Will is another subplot explored in the arc.