Four hundred readers will read Robert A. Caro’s “The Power Broker” aloud from cover to cover in a round-the-clock marathon at Judgy Baby, 170 Second Avenue in Gowanus, beginning Thursday, November 12 at 7 p.m.

Billed as the first-ever marathon reading of the book, the event opens Thursday evening with several notable readers and then continues in 10-minute increments around the clock through the weekend. Organizers anticipate a conclusion Sunday midday.