Fred was about to light the grenade when I stopped him. "But how does this help us get The Book?"
Fred looked at me like I had just won first prize in a Dumb Questions contest. "We throw the grenade, and while it's doing its thing, we swoop down on a rope right into Blackbeard's cabin, find The Book, and head on home." Then he added for emphasis: "Duh."
Oh. I should have seen it all the time. Don't know how I missed it.