Before San Francisco lawyer John O’Connor exposed W. Mark Felt as Deep Throat in the July 2005 issue of Vanity Fair, few people knew as much about the one-time assistant director of the FBI as Ralph de Toledano, who helped ghostwrite Felt’s 1979 biography, “The FBI Pyramid from the Inside.”

Now, de Toledano contends in a suit filed July 3 in the U.S. District Court for the District of Columbia that he was duped — not simply about Felt’s secret but by O’Connor, Felt and Felt’s son over the rights to the 1979 book.