This is the best place to follow for notice of future releases of my books, Commonweal or otherwise.
I'm presently writing #4, provisionally "Under One Banner", and intermittently posting about the progress of writing it. It's late, because it should have been done before #3, "Safely You Deliver", went to the copy-editor.
"Safely You Deliver" is expected to escape into the wild in April sometime. (Yes, that would be April of 2016.) This would maintain the vaguely-annual schedule I've been aiming for.
May no ill thing arise.