Wolfpack, by Amelia Brunskill

In an insular cult living deep in the woods, nine teen girls have formed their own little subgroup, supporting and looking out for each other.  Living in an outbuilding away from the rest of the people, they have gained a level of independence and self-government even though they must still follow their sect's rules. 

One day, they wake up to find one of their number is missing.  Worried about the consequences of the defection being discovered and convinced that she will eventually return, the girls attempt to cover up the disappearance.  But when they find out that the missing girl was pregnant and that she was subsequently murdered, they start to investigate what actually happen.  They end of unraveling layers of corruption within their utopia that exposes that their home is far from safe.

As I never tire of saying, verse novels are either great or terrible.  There is no half-way point.  Usually, a verse novel works best for a sad melancholy story because it amps up the poignancy of the protagonist's angst.  Here, the spare verse makes the story more suspenseful and more paranoid.  With so many characters, its hard to get much development in them, but it doesn't matter as the story just races ahead.  The surprise ending isn't well foreshadowed but the conclusion is satisfying and thought provoking.  Entertaining and engaging.