A Kiss Before Sleuthing — Gosho Aoyama

The Metropolitan Police force is in an uproar over the big news: at long last, star-crossed police detectives Sato and Takagi are going on a date! But their romantic afternoon at an amusement park turns into a roller-coaster ride when they find a backpack full of smuggled heroin. Can Conan catch the drug runners and save the detectives' date? Then the Junior Detective League decides to track down Doc Agasa's long-lost first love. But to find her, they'll have to crack a numerical code that takes them on a wild goose chase through the local zoo!