Dangerous Nan McGrew: Dangerous Nan McGrew is the sharp-shooting expert of a traveling medicine show that is stranded in the Canadian northwest at the snowbound hunting lodge of wealthy Mrs. Benson. Nan is invited to put on a show for the benefit of Mrs. Benson's Christmas-Eve guests. While performing her boop-a-doop songs, Eustace Macy, the saxophone-tooting nephew of Mrs. Benson falls in love with Nan. And, then, the villain, the bank-robbing Doc Foster, makes his entrance. Can Dawes of the Royal Mounted be seen slushing in pursuit behind the gangster? Could Be.