"[T]he author does a good job of creating enough suspense to keep readers engaged. The writing is solid, the story is believable and the author has incorporated messages about intellectual and physical freedom, as well as environmental issues…it will appeal to reluctant and young teen readers."
— Canadian Children's Booknews
"Collins weaves an intricate story that keeps readers intrigued and thinking about the meaning of truth and whether being sheltered from it is preferable to hard reality...Collins moves beyond the basic mystery and explores the intricate workings of the mind, the body, and the power of basic knowledge. Her story will keep readers engaged from beginning to end."
— School Library Journal
"A most interesting story for younger readers, who enjoy a tale with a distinct difference. In an odd town a girl named Serenity vanishes. Katherine must find the truth as those in town try to keep their secrets intact. Both creepy and very compelling."
— Shelf Life
"What Happened to Serenity? is a well written, well placed dystopian novel. Collins has created a strong heroine and has created a world that his both familiar and distant...This novel would be a good one for those interested in dystopian societies and for those who are interested in conspiracy theories and the government."
— Resource Links
"Katherine is a strong and interesting character. Her relationships with her family, teachers and friends are well conceived and realistic. The tension between Katherine and her mother is an especially authentic and touching portrayal of the mother-daughter relationship. . . An ideal addition to a middle school dystopian literature collection"
-- CM Magazine
"Collins? writing grabs hold of the reader and never lets go. Her use of Katherine to question our own society is worthwhile reading for both teenagers and adults. She reminds us all that there are ideals worth fighting for. "
-- The Waterloo Record