NEW YORK • As the Manhattan District Attorney’s Office ramps up its yearslong investigation of Donald Trump, a new book by a former prosecutor details just how close the former president came to getting indicted — and laments friction with the new district attorney that put that plan on ice.

Mark Pomerantz, who oversaw the investigation until early last year, writes in “People vs. Donald Trump: An Inside Account” that then-district Attorney Cyrus Vance Jr. authorized him in December 2021 to seek Trump’s indictment.

After scouring Trump’s life and business, Pomerantz writes that prosecutors agreed on a case involving allegations that Trump falsified records by inflating the value of assets on financial statements he provided lenders.

Vance was leaving office within weeks but expressed confidence that his successor, Alvin Bragg, would agree with his assessment, Pomerantz writes.

But Bragg and his team, after taking control of the investigation in January 2021, had other ideas — expressing trepidation about the strength of evidence and the credibility of a key witness.

They decided not to proceed — at least not with the speed Pomerantz and co-lead prosecutor Carey Dunne had wanted.

The stagnation compelled both men to leave the office.

“Once again, Donald Trump had managed to dance between the raindrops of accountability,” Pomerantz writes in the book, which is set to be published Tuesday by Simon & Schuster.

News outlets received copies of the book Friday.

Trump has threatened legal action against Pomerantz and Simon & Schuster for what he contends are “defamatory statements” and “groundless falsehoods” about his alleged criminal conduct. Messages seeking comment were left Friday for Trump’s lawyers.

Trump has repeatedly denied wrongdoing and said the New York investigations are attempts by Democrats to keep him out of the White House.

The 304-page volume weaves Pomerantz’s behindthe-scenes account of the spirited battle over whether to charge Trump with anecdotes from his decades-long career as a Mafia prosecutor and white-collar litigator.

The book also works to temper the drama surrounding Pomerantz’s split from Bragg, which spilled into the public last year when his resignation letter appeared in The New York Times.

Pomerantz portrays the dispute not as a brawl, but as a legitimate difference of opinion shaped by lengthy Zoom calls and telephone conversations.