Finally started this last night, read half in about 20 minutes, finished the last half in 20 minutes this morning. I have to agree with a friend who said she feels cheated. It's just so, so short.
Gardner's a fantastic author and I love this series. I'm going to start Catch Meneed this. This is one of the very small series that I hope goes on for a long time. Catch Me is the 6th full book with this as a companion book.
I forget what I paid for it. If its 99cents I'd say it's "worth" it. Anymore than that I'd have to admit you're not missing a thing by not reading this.