This was thrilling, fast read. Jennifer and Esther are just as compelling characters as their adult selves at the start of the novel, as they are as their fictionalized teenage selves in the simulation. The part that unsettled me the most was the characters' continuation to be stuck as their false teenage selves at the end, smothering the remainder of the memories from their adult lives and real childhoods. Jennifer loses her adult self but gets to keep her reputation and company. Esther loses everything, including losing her dad again and losing the drive that the horrific circumstances of his original death had stoked for her to seek out pseudoscience and charlatans to debunk. Not my favorite Mira Grant book, but not a bad read.