Private detective Donegal Dawn is summoned by the police commissioner to solve the reasons for a crime wave in Chinatown. Private detective Donegal Dawn is summoned by the police commissioner to solve the reasons for a crime wave in Chinatown. Private detective Donegal Dawn is summoned by the police commissioner to solve the reasons for a crime wave in Chinatown. Private detective Donegal Dawn is summoned by the police commissioner to solve the reasons for a crime wave in Chinatown.