The second book is titled "A Prince in Need," and it also opens with all the King of Myrridia being murdered.
The percentages of a book being converted to a movie are very slim, and the chances that it will become famous are even smaller. http://Bachelor-Fp.Phys.Uni-Goettingen.de/doku.php?id=the_mo_e_popula_fiction_autho_s_in_ame_ica_by_associated_with_sales