Mostly known for his mystery novels, Keigo Higashino writes novels in other genres as well. Some of his works are translated into English like selected works of the Kyoichiro Kaga series and the Galileo series. His most famous novel is certainly 容疑者Xの献身 which won many awards, including the Naoki Prize.
This is the 5th book of the Galileo series but only the second novel (with The Devotion of Suspect X). This is an excellent howdunnit that has been translated into English by Alexander O. Smith under the title Salvation of a Saint