In 1943, U.S. marines are stationed near Wellington. One of them  is murdered by the boss of the Hotel Workers Union, who is  sitting pretty, exempt from military service and living it up on  black market profits. Girls under the control of the union - of  whom the victim's fiancee, Rose, is one - give sexual favours to  the Americans, in return for information. The marine assigned to  investigate the murder, tries to find Rose through a public  health nurse who traces VD infections. However they discover  there it more going on than they realized, involving a conspiracy  amongst the Union, the government and the U.S. military.