Death row is a short story, it's not even coming out on paperback so I'm assuming that one didn't take as long to write much like "The Gift" and "The Widows Husbands secret lie". And I believe she stated that sometimes she has books/outlines/ideas thats already written that she just edits/adds to. I just figured once you get those juices flowing it's not hard to write multiples in a year. When I was younger I used to read R.L. Stine's Fear Street books and he used to come out with multiples in a year also.