Wonderful book: "Land of Lisp" - Conrad Barski is a great author and communicator
I have been enjoying Conrad Barski's web based tutorials for years and I recently received his new book Land of Lisp: Learn to Program in Lisp, One Game at a Time! in the mail.
I have been writing Lisp code since the late 1970s and in ancient times I wrote two Lisp books for Springer Verlag. To be honest, I just bought the book for enjoyment but I find myself getting a new perspective and learning more about Common Lisp.