There are problems with impeaching Donald Trump. A big one is the holy terror waiting in the wings.

That would be Mike Pence, who mirrors the boss more than you realize. He’s also self-infatuated. Also a bigot. Also a liar. Also cruel.

To that brimming potpourri he adds two ingredients that Trump doesn’t genuinely possess: the conviction that he’s on a mission from God and a determination to mold the entire nation in the shape of his own faith, a regressive, repressive version of Christianity. Trade Trump for Pence and you go from kleptocracy to theocracy.

That’s the takeaway from a forthcoming book by the journalists Michael D’Antonio, who previously wrote “The Truth About Trump,” and Peter Eisner. It’s titled “The Shadow President: The Truth About Mike Pence,” it will be published on Aug. 28 and it’s the most thorough examination of the vice president’s background to date.

I got an advance look at it, along with a first interview about it with D’Antonio, and while it has a mostly measured tone, it presents an entirely damning portrait of Pence. You’ve seen his colors before, but not so vividly and in this detail.

The book persuasively illustrates what an ineffectual congressman he was, apart from cozying up to the Koch brothers, Betsy DeVos and other rich Republican donors; the clumsiness and vanity of his one term as governor of Indiana, for which he did something that predecessors hadn’t and “ordered up a collection of custom-embroidered clothes — dress shirts, polo shirts, and vests and jackets — decorated with his name and the words Governor of Indiana”; the strong possibility that he wouldn’t have won re-election; his luck in being spared that humiliation by the summons from Trump, who needed an outwardly bland, intensely religious character witness to muffle his madness and launder his sins; and the alacrity with which he says whatever Trump needs him to regardless of the truth.

In Pence’s view, any bite marks in his tongue are divinely ordained. Trump wouldn’t be president if God didn’t want that; Pence wouldn’t be vice president if he weren’t supposed to sanctify Trump. And his obsequiousness is his own best route to the Oval Office, which may very well be God’s grand plan.

“People don’t understand what Pence is,” D’Antonio told me. Which is? “A religious zealot.”

And D’Antonio said that Pence could end up in the White House sooner than you think. In addition to the prospect of Trump’s impeachment, there’s the chance that Trump just decides that he has had enough.

“I don’t think he’s as resilient, politically, as Bill Clinton was,” D’Antonio said. “He doesn’t relish a partisan fight in the same way. He loves to go to rallies where people adore him.”

There’s no deeply felt policy vision or sense of duty to sustain him through the investigations and accusations. “If the pain is great enough,” D’Antonio said, “I think he’d be disposed not to run again.”

So it’s time to look harder at Pence. “The Shadow President” does. It lays out his disregard for science, evident in his onetime insistence that smoking doesn’t cause cancer and a belief that alarms about climate change were “a secret effort to increase government control over people’s lives for some unstated diabolical purpose,” according to the book.

It suggests callousness at best toward African-Americans. As governor, Pence refused to pardon a black man who had spent almost a decade in prison for a crime that he clearly hadn’t committed. He also ignored a crisis — similar to the one in Flint, Mich. — in which people in a poor, largely black Indiana city were exposed to dangerously high levels of lead. D’Antonio told me: “I think he’s just as driven by prejudice as Trump is.”

During the vice-presidential debate with Tim Kaine, Pence repeated the laughable, ludicrous assertion that Trump would release his tax returns “when the audit is over” and falsely insisted that Trump hadn’t lavished praise on Vladimir Putin’s leadership — though the record proved otherwise.

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The book says that in a high-level briefing about Russian interference in the 2016 election, Pence was told that intelligence officials hadn’t determined whether that interference had swayed the results. He then publicly claimed a finding of no effect.

At Trump’s urging and with taxpayer money, he and his wife, Karen, flew to a football game in Indianapolis just so he could make a big public gesture of leaving in protest when, predictably, some of the players took a knee during the national anthem.

And, following Trump’s lead, he rallied behind the unhinged former Arizona sheriff Joe Arpaio. In a speech he called Arpaio a “tireless champion” of the “rule of law.” This was after Arpaio’s contempt-of-court conviction for ignoring a federal judge’s order to stop using illegal tactics to torment immigrants. The conservative columnist George Will seized on Pence’s speech to write that Pence had dethroned Trump as “America’s most repulsive public figure.”

You can thank Pence for DeVos. They are longtime allies, going back decades, who bonded over such shared passions as making it O.K. for students to use government money, in the form of vouchers, at religious schools. Pence cast the tiebreaking vote in the Senate to confirm her as education secretary. It was the first time in history that a vice president had done that for a cabinet nominee.

Fiercely opposed to abortion, Pence once spoke positively on the House floor about historical figures who “actually placed it beyond doubt that the offense of abortion was a capital offense, punishable even by death.” He seemed to back federal funds for anti-gay conversion therapy. He promoted a constitutional amendment to ban same-sex marriage.

“He is absolutely certain that his moral view should govern public policy,” D’Antonio told me.

D’Antonio then recounted two stories that he heard from college classmates of Pence’s after the book had gone to bed, so they’re not in there. One involved a woman in Pence’s weekly college prayer group. When she couldn’t describe a discrete “born again” experience, “he lectured her on her deficiencies as a Christian and said that she really wasn’t the sort of Christian that needed to be in this group,” D’Antonio said.

Another involved a college friend of Pence’s who later sought his counsel about coming out as gay. D’Antonio said that Pence told the friend: “You have to stay closeted, you have to get help, you’re sick and you’re not my friend anymore.”

According to D’Antonio’s book, Pence sees himself and fellow Christian warriors as a blessed but oppressed group, and his “hope for the future resided in his faith that, as chosen people, conservative evangelicals would eventually be served by a leader whom God would enable to defeat their enemies and create a Christian nation.”

I asked D’Antonio the nagging, obvious question: Is America worse off with Trump or Pence?

“I have to say that I prefer Donald Trump, because I think that Trump is more obvious in his intent,” he said, while Pence tends to “disguise his agenda.” D’Antonio then pointed out that if Pence assumed the presidency in the second half of Trump’s first term, he’d be eligible to run in 2020 and 2024 and potentially occupy the White House for up to 10 years.

Heaven help us.