If you have an early chapter book reader that longs for adventure and a little tension as they read about kids saving the day in every story, this series may be what you need. The Scholastic Branches series books all have similar features: short chapters, lots of illustrations to support reading, and 2nd graders up to the task of handling any odd situation (or in this case monster) that they may come across.
This is book nine of the series and the students are going on a field trip. Alexander, Nikki, and Rip are frustrated by this particular amusement park as it is quite different than they expected, but then things get a bit weird, someone from their group goes missing, and the kids focus on their club notebook to solve the mystery and be rid of the the coaster ghost!
My students love these Branches series books and this series The Notebook of Doom is a favorite, for sure.