After loving "The Demon Barker of Wheat Street," I decided to read "The Chapel Perilous" before jumping into Trapped. Since "The Chapel Perilous" is available on Kindle, I started reading it right after finishing writing my review of "The Demon Barker" (but I went to a friend's house soon after, so I didn't finish reading it until now).
"The Chapel Perilous" takes place after the other two short stories (according to the author's note, it's four years before Trapped). Atticus, Oberon, and Granuaile are taking a break from training to go camping. They're sitting around the campfire and ask him for a story. And so Atticus tells them about when he recovered the Holy Grail as Sir Gawain. Of course, it wasn't known as the Holy Grail at the time, but was Dagda's Cauldron, which was never emptied of food. Atticus was sent to retrieve the Cauldron by Ogma of the Tuatha De Danann. The cauldron was stolen by a Pict, who had hidden it beyond the Tuatha De Danann's sight. And so he journeyed into the realm of the Fisher King to retrieve it.
While not as good as "The Demon Barker of Wheat Street" and "Two Ravens and One Crow," "The Chapel Perilous" was still very interesting. I learned a bit more about Atticus's history and the Tuatha De Danann, so in my mind this was definitely a story worth reading!