In high school I had a Philosophy class, and its book [0] had chapters in which their endings short stories. Two of the chapters (5: Learning and Intelligence, 14: Reality) had interesting excerpts from Smullyan's books Alice in Puzzle-land [1] and Five Thousand B.C. and Other Philosophical Fantasies [2], respectively. They highlight philosophical concepts in a way that makes them sort of 'self-explanatory', especially for a beginner student. He also has a textbook, Set Theory and the Continuum Problem which is a rigorous and technical work, and does a great job introducing and developing some results on the idea of forcing [3].
[0] Introducción a la Filosofía, César Tejedor.
[1] https://static01.nyt.com/packages/pdf/crossword/Smullyan_Ali... the story is in pp. 1-6
[2] https://books.google.cl/books?id=fzuKc5dGN5gC&lpg=PT80&ots=Q... until the comment of Second Positivist