The son of a world famous mystery writer, Jimmy Kudo, has achieved his own notoriety by assisting the local police as a student detective. He has always been able to solve the most difficult of criminal cases using his wits and power of reason.
Conan and the Detective Boys, who are accompanied by Professor Wakasa and Subaru Okiya to the beach, encounter a case. The victim is the manager of a beach house, and the suspects are the staff. Who is the culprit? And what is the relationship between Wakasa and Okiya?