First, a friend on Facebook pointed me to a recent article at Tor.com featuring Quicksilver as one of Five Books With Asexual Protagonists (and furthermore declaring my post about writing Tori's character to be "excellent", which was a nice bonus).
Then today I got a package in the mail containing two US hardcover copies of A Pocket Full of Murder which, at first glance, seemed no different from the author copies I already had. I was mystified at first, but then I spotted the note tucked inside:
Your book has reprinted! Please find a sample copy enclosed.
And sure enough, when I checked the title page it turned out to be the SECOND edition. Whoop!
I am so, so, happy and relieved to know that the book is doing well enough to exceed my publisher's expectations -- and I suspect making this year's CLA Top Ten Best Books for Children shortlist probably had a good deal to do with the bump in sales, so I am grateful for that all over again.