Shinichi “Sonny” Chiba returns as the reckless son of a private detective takes on the case of a minor league baseball pitcher who disappears right before signing a contract into the major leagues. Meanwhile, the body of an orthopedist is discovered in the river.

Ichiro (Chiba) is a scrappy little sport in a big car and funny hat always looking for some fun and some extra cash on the side. He and his friends get themselves involved in some shady business dealings involving a kidnapping.