Detective Conan - Episode 1149: The Detective Boys and the Two Leaders (Part Two)

A trip to the seaside unexpectedly turns into a criminal case when the manager of a beach hut is found strangled to death. The investigation focuses on three employees, none of whom can provide solid alibis. A crucial clue is the discovery that several juice cartons were tampered with to induce deep sleep in the victim and another employee. Through careful analysis, it becomes clear that a specific medication, when mixed with grapefruit juice, can enhance the effect and cause extreme drowsiness.

A beach towel becomes the key to uncovering the culprit. Fingerprints initially point suspicion toward one employee. However, it soon becomes apparent that someone staged the situation to frame others by asking for help tying an improvised outfit, thereby transferring fresh prints onto the towel. Further clues suggest that the true perpetrator acted out of a personal motive related to a deceased relative. They used the tampered juice cartons to ensure the victim was unconscious before being strangled.

The plan is exposed when subtle stains and missing items reveal how the killer arranged everything: they manipulated which juice the victim would drink, prepared multiple straws to ensure one would be used, and switched towels to leave false traces. In the end, the true motive and method are revealed, the culprit is arrested, and the case of the beach hut is solved.