A seventeen-year-old detective gets shrunk to seven, so he has to solve murders from inside a kid's body while hunting the organization that did it to him. The cases are real mysteries, not window dressing, and the show respects your intelligence enough to let you actually solve them before Conan does. Twenty-five years later it's still running because it found the one formula that never gets old: a brilliant mind trapped in the wrong shape, solving one puzzle after another, getting closer to the people who ruined his life. The pacing can drag when filler stretches thin. What keeps you watching is simple: you need to know if he ever gets his body back, and whether Ran figures out who he really is before he tells her.
Seventeen-year-old detective prodigy Shinichi Kudo operates in the shadows of Tokyo's criminal underworld, solving cases that baffle everyone else. Then one night, after witnessing something he shouldn't, he's poisoned by a mysterious organization and shrinks into the body of a seven-year-old child. Trapped in this tiny frame with no way to reveal his true identity without endangering those around him, Shinichi assumes a new name and moves in with Ran, the girl he's loved since childhood, posing as her distant cousin. What should be a temporary situation spirals into something far more complicated. While searching for clues about the organization that did this to him, Shinichi finds himself pulled into an endless parade of murders, thefts, and puzzles. He solves them all from the shadows, feeding answers to Ran's bumbling detective father, who takes credit for every breakthrough. The cases pile up faster than the answers, and the bigger mystery remains unsolved: what was that organization after, and can Shinichi find a way to become human again before his old life disappears entirely?