Myrtle, a silly, innocent flapper, falls in love with Marty, a dapper gangster, and learns too much for her own good about Skeeter, the gang leader.  Skeeter threatens to rub her out, and Myrtle appeals for help to Dan Callahan, a veteran detective with flat feet and a tough disposition.  Dan puts her up in his boardinghouse and against his better judgment soon falls in love with her; he asks her to marry him, and out of gratitute she agrees.

Dan eventually learns that Myrtle is in love with Marty, and he reunites them, meantime helping Marty to take his first, tentative steps on the straight and narrow path.