Do we need a sequel?

I really liked 13 Little Blue Envelopes, it was a good read, with a good ending. Never ever thought she would write a sequel or need to, but today I found out she has. It is titled The Last Little Blue Envelope and it releases April 26th. I can tell you where the title comes from, (Spoiler!) at the end of 13 Little Blue Envelopes the last envelope is stolen and is never recovered. Apparently a boy in this book is holding it ransom, for what we don't know. So we will see how this all works out....