12 titles recommended if you like Detective Conan: Sunflowers of Inferno
Case Closed: The Fourteenth Target
Detective Conan: The Private Eyes' Requiem
Detective Conan: Strategy Above the Depths
Detective Conan: The Time Bombed Skyscraper
Detective Conan: Magician of the Silver Sky
Detective Conan: Black Iron Submarine
Detective Conan: The Bride of Halloween
Detective Conan: Crossroad in the Ancient Capital
Detective Conan: Quarter of Silence
Detective Conan: The Darkest Nightmare
Detective Conan: The Million-Dollar Pentagram
Case Closed: Countdown to Heaven