SPR Council member Dr Zofia Weaver has produced a book on Polish medium Franek Kluski, to be published by White Crow Press in March 2015. It is called Other Realities?: The enigma of Franek Kluski’s mediumship.
Further details, with a sample chapter, can be found here:
http://whitecrowbooks.com/books/page/other_realities_the_enigma_of_franek_kluskis_mediumship/
Carlos Alvarado has interviewed Dr Weaver about the book: