In the first book of the Halley Harper series, despite being named after Halley's comet, 9 year old science-loving Halley Harper overhears someone calling her a square peg in a round hole and almost believes it to be true. Then an adventure to summer camp takes her on a journey to use her quirky love of science to turn the ordinary into extraordinary. Will she save her beloved summer camp, her friends, and even herself using the Laws of Motion? Make sure to grab the second book in the series, The Friendship Experiment.

In the second book of the Halley Harper series, Halley believes science is magic, just like her friendship with Gracelyn. Until one day they can no longer be together. How will she be able to go back to Camp Eureka without her best friend and partner in science?At camp, Halley has to confront a new mean girl and try to survive a magic chemistry show that proves to be explosive. To make matters worse, Halley loses her diary where she wrote her inner most thoughts about her friends and the secret treasure of Camp Eureka. Can she save her friendship and locate her diary before it falls into the wrong hands?

Science girl extraordinaire Halley Harper can’t believe she is on live TV, until disaster strikes forcing her to grow up and act like the eleven year old she almost is. But why does she still feel stuck in the middle—too little for some things and too big for others?To prove how responsible she is, she offers to babysit her little brother Ben. But that ends up being a disaster too! To make matters worse, their family is moving right before she starts middle school, taking her away from everything she loves: her best friend Gracelyn, her treelab, and life as she knows it.At least she always has Camp Eureka, and that will never change. But will a secret admirer alter her friendship with Nathan? Will she get along with the dinosaur-loving shy new girl? Can the fossil she discovers rock climbing be the key to getting life back the way it was, or will she realize that, no matter what, life always changes?

Miss Disaster strikes again, but now it’s at the White House in front of the President of the United States! Halley Harper decides that it’s time to give up science forever and focus on fitting in and being popular. Meanwhile, someone steals her invention and one of her best friends goes missing. Will going back to nature help her feel like herself again? Can she solve the mysterious nature codes before it’s too late? But more importantly, will she figure out how her Camp Eureka arch nemesis and her beloved Grammy know each other, and just who are the Extraordinaires…

In the final book of the series, Halley Harper's science experiment has finally made it into outer space and if successful, will change the space program forever! But as always, Miss Disaster strikes again and her experiment causes the space station to lose power and go completely dark! How will she save the astronauts trapped in the space station from being lost in outer space? Can she beat Nathan, her camp crush, to be the first thirteen-year-old astronaut? Where in the world is Ms. Mac and will Halley be able to find her before it's too late?