Wow - time moves fast! Blood Diamond, the sixth book in the Serial Investigations series, is up for pre-order now. Use that link to place your order for the ebook and receive it as soon as it goes live!
The paperback will be hopefully going live at around the same time, although Amazon unfortunately doesn't offer a pre-order phase for self-published books at this time. I'll do my best to make sure that you can get your hands on both at once, but the process can take variable amounts of time depending on how busy they are - so just keep your fingers crossed and refresh the page on the 26th October if you don't see it available yet!