Reviews for Phase Null are generally more positive than for the previous prequel, The Kill Order , though opinions vary on its necessity:
The novel reveals that Teresa entered the Maze with her memories intact, adding a layer of complexity (and controversy) to her actions throughout the original trilogy. Dashner, James [Die Auserwählten 05] • Phase ...
A pivotal moment occurs when a Flare outbreak among ANGST staff forces Thomas and others to participate in a "Purge"—a systematic execution of infected adults to protect the project. Reviews for Phase Null are generally more positive