The narrative follows a famed detective and his assistant as they pursue a gang that abducts two handcuffed prisoners from their launch in a violent riverside chase. After collisions and a fog-hidden escape among wharves, the sleuth races to prevent further harm to a deposed foreign ruler entangled with the criminals. The account emphasizes swift, physical action, improvisatory seamanship, and tense confrontations with hired thugs, unfolding in short, episodic chapters that blend detective resourcefulness with pulp-era adventure and urgent rescue scenes.