The playful title of Peter Turchi’s new book is a hint at what lies inside. “A Muse and a Maze” is about not only muses and mazes but about what amuses and amazes us. Like his 2004 book “Maps of the Imagination” — an equally fascinating foray into the idea of writing as cartography — “A Muse and a Maze” is meant to “invite writers to think differently about what we do.” But there is plenty here for any curious reader.