Waiting on Wednesday - Under Their Skin by Margaret Peterson Haddix

Waiting on Wednesday is a weekly event hosted by Jill at Breaking the Spine where we spotlight upcoming releases that we're eagerly awaiting.  This week my choice is a new book, which I guess is going to be a new series by a favorite author of mine, Margaret Peterson Haddix.  I loved her Among the Hidden series, as well as her Found series.  But here is the blurb from Goodreads about this new series:

From New York Times bestselling author Margaret Peterson Haddix comes the first book in a brand-new thrilling series about twins who are on a quest to discover the secrets being kept by their new family.

Nick and Eryn's mom is getting remarried, and the twelve-year-old twins are skeptical when she tells them their lives won't change much. Well, yes, they will have to move. And they will have a new stepfather, stepbrother, and stepsister. But Mom tells them not to worry. They won't ever have to meet their stepsiblings.

This news puzzles Nick and Eryn, so the twins set out on a mission to find out who these kids are - and why they're being kept hidden.

I think it sounds like an interesting new series!  What do you think? Have you read this author before?  And what book are you eagerly awaiting this week?