The Collective by Alison Gaylin

Grief and anger go unchecked when your child is killed. Common sense and behaving badly in public are second nature when all you want is justice and revenge. Camille knows these feelings all too well after losing her teenage daughter and seeing her daughter's killer go free. After an embarrassing public display she hears about what she thinks is a grief group made up entirely of mothers who have lost their children but The Collective turns out to be so much more. These mothers take the law into their own hands and to join them means complete obedience and sworn to secrecy forever. You are making a deal with the devil but it is one that Camille makes willingly. This intense nail biter of a thriller has you working along side Camille desperate to figure out the identity of the puppet master and hoping she can stay one step ahead of it all. These are moms you don't want to mess with.  4 1/2 stars