Keigo Higashino's 'The Devotion of Suspect X' is a masterclass in psychological suspense, featuring his popular detective Manabu Yukawa, also known as Professor Galileo. When a single mother accidentally kills her abusive ex-husband, her reclusive neighbor, a brilliant mathematics teacher named Ishigami, offers to help dispose of the body and create an impenetrable alibi. As Inspector Kusanagi and Professor Galileo investigate, they are confronted with a meticulously constructed web of deceit, making it nearly impossible to uncover the truth. The novel delves deep into themes of loyalty, obsession, and the lengths one might go to protect another, showcasing Higashino's exceptional ability to craft intricate puzzles and explore complex human emotions.