The Tainted Cup, by Robert Jackson BennettReally good read. Another I just discovered this week and enjoyed the hell out of was The Raven Scholar by Antonia Hodgson. It follows some of the coming-of-age, fight-in-a-giant-contest-to-rule tropes, but it is really well written with a protagonist I really liked. It's also refreshingly witty with a raven god and...you know, I'm not going to do it justice, but the ravens are amazing.
Another recommendation for a clever, cozy riff off Arthurian legend is Greenteeth by Molly O'Neill. There's a wonderful female friendships at the heart of that one.
The always-delightful Peter was one of my favorite follows on Tumblr, and I'm so sad for Diane Duane and the rest of his loved ones. What a loss.I haven't read any of Peter Morwood's work, but that's very sad.