Meitantei Conan

Synopsis

The Junior Detective League, along with Rachel and Richard, are at a beach one day when they come across a wealthy couple; Colt Lielander and his wife, Tandi. George finds an SOS in a bottle by the now missing Tandi Lielander, though Colt claims it's her attempt at getting attention. They take a raft and find her in a cave, drowsy. Tandi explains Colt tried to murder her by drugging her and letting the tides rise. The tides have risen to a point where they can not leave the cave. Conan leads the gang through the maze of a cave and escape to a quarry. They encounter Richard and Colt, who is exposed for his crime. Colt holds Amy at gunpoint and threatens to kill everyone, confessing that he discovered Tandi's plans to divorce him despite not being abusive and giving her everything that she wanted. Rachel and an old guard arrive in time to save them. Colt is arrested while Richard is sternly lectured by the old guard for fishing in the quarry, which is off-limits.

(Source: Wikipedia)