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