php - View products in a category with certain value of custom attribute via CMS Page in Magento -

i have made book store in magento. have made custom attribute called 'author' has names of author has written book.
have made categories book fiction, fantasy, horror.
have made cms page every author. eg. cms page of author abc. have categories listed i.e (fiction, fantasy, horror) inside cms page.
when user clicks on fantasy link on cms page need redirect page listing books under fantasy category author abc tried giving link "magento.com/fantasy?author=1" when click, redirects "magento.com/fantasy".
how list books under fantasy category author abc ?

you should check how default magento sends parameters in url. when url switches protocol http https, params appended "? = " lost.

try using following format : magento.com/fantasy/author/1/

also ensure attribute filterable in layered navigation , category marked anchor.

hope helps!!