Three American naval officers are assigned to a newly commissioned submarine, the Grant. The US navy wants commander Jack, ensigns Hal and Eph to break up a big smuggling operation along the New Jersey coast that is costing the government millions. Along the way, they race to a doomed steam ship, The Cynthia, carrying over a thousand souls who will all surely perish without the Submarine Boys. It is a great mystery adventure. The Submarine Boys will make your day! (Summary by John)
