I highly recommend this book, In Search for Japan's Hidden Christians, to add to what has been said by joelunch.
In Search of Japan's Hidden Christians: A Story of Suppression, Secrecy and Survival https://www.amazon.com/dp/4805313560/ref=cm_sw_r_cp_apa_i_YYmwDbSC4N0YC
Samurai William: The Englishman Who Opened Japan https://www.amazon.com/dp/0142003786/ref=cm_sw_r_cp_apa_i_zZmwDbVYM6T8Z