Dead Man's Hat by Hulbert Footner

When New York's most powerful criminal gang plans to get control of the largest city bank, Dave Westover, a clerk, found himself inextricably involved in the maelstrom of events.

First, lovely Paula Wrenn's appeal for help sent him riding around New York in a taxicab with a dead man at his feet. Then, accused of two more murders, he spent days and nights avoiding both the police and the underworld, his face on the front page of every paper, his life constantly in danger.

Checked at almost every turn, he managed to get enough evidence to convict the man whose unscrupulous use of his power was threatening the safety of the city's banks—the man responsible for scores of hitherto unsolved murders!