Jacqueline Winspear actually kicked off her book tour for In This Grave Hour at The Poisoned Pen the day before release date (with permission from the publishers). Those of us in attendance were able to buy copies, but told not to read them until midnight (smile).
There are some photos of this event.
If you didn’t have a chance to get to the program, you can watch it on Livestream. https://livestream.com/poisonedpen/events/6962952
And, you can order a signed copy of In This Grave Hour through the Web Store. https://bit.ly/2mXsQnN