The Watchtower by Lee Carroll

The Watchtower is the second book in a trilogy of books by husband and wife duo, Carol Goodman and Lee Slonimsky. It continues to follow Garet Jones on her adventure to the Summer Country after the events that unfolded in New York a few months prior. She's on a mission to find Will Hughes and the box that he took with him; this time her journey takes her to Paris and to even more fae than before. The book also reveals more of Will Hughes path as it switches its point of view in each chapter.