British intelligence professional Christopher Steele, whose dossier about Donald Trump and Russia rocked the U.S. political world in 2017, will offer a warning about the former president in a new book.

Mariner Books will publish Steele’s Unredacted: Russia, Trump, and the Fight for Democracy next month, the press announced in a news release, calling the book “a riveting warning on the threat Putin and Trump pose to democracy, based on alarming new intelligence.”

Steele worked as an officer for the U.K.’s Secret Intelligence Service, better known as MI6, for 22 years before retiring and founding his own private intelligence firm in 2009.

He was catapulted into the headlines in 2017 after a dossier he prepared for Fusion GPS—a strategic intelligence firm that had been funded by the Democratic National Committee and Hillary Clinton’s 2016 presidential campaign—was published by BuzzFeed. The dossier claimed that Russia and the Trump campaign had colluded to help Trump and damage Clinton’s campaign, and that Russia had compromising information about Trump.

In the book, Mariner says, “Steele shares for the first time what [his] inside view looks like, how he came to the point of gaining such a level of insight, and what Western governments—and all of us—can and should do to counter this generational threat.”

“Putin is now desperate to have Donald Trump back in the White House,” Steele said in a statement. “If Putin succeeds in helping Trump get reelected, I am convinced that the global political order will be utterly changed. We shall have entered a new historical era of strategic chaos, a ‘new world disorder.’”

Unredacted is slated for publication on Oct. 8, less than one month before Election Day.

Michael Schaub is a contributing writer.