Okay, the bad news first because it isn't that bad. Amazon is listing Book Five as "currently unavailable". This is just for a day or two and is while we get our new printer to sort out a couple of minor details. You can still place orders, and it probably won't delay delivery by more than 24 hours or so.
The good news is that this should improve consistency of printing between the first four books and these latest ones. So please bear with us - it's a learning curve, but it's an upward one. And another bit of good news is that we're now expecting to have Book Six on sale before the end of September. Tell your friends. Come to that, tell your enemies.