Reese, Maelie, and Devon are back! But everything else has changed.

When Paige Andrews and I were planning Monster Sitter, we knew we wanted it to be a trilogy. And I had an idea — what if we set each book about five years apart? That way, we could see Maelie at different stages in her life.

So in Monster Trainer, Maelie is now twelve and that’s made for some very interesting new dynamics as Reece tries to navigate a life of increased responsibility as opposed to just being Ms. Slash-a...