An explosive new book by author Peter Schweizer reveals how five members of 2020 presidential candidate Joe Biden’s family got rich off of his political connections during the Obama years.

The book, titled Profiles in Corruption: Abuse of Power by America’s Progressive Elite, lays out how Biden’s veep status helped “the Biden Five”—his reprobate son Hunter Biden, brothers James Biden and Frank Biden, son-in-law Howard Krein, and sister Valerie Biden Owens—cash in.

As most people know, Hunter Biden secured a lucrative position with Ukrainian natural gas firm Burisma while his father was vice president even though he had little to no experience in the field. He also forged business deals with individuals and entities tied with the governments of Russia, China, and Kazakhstan, reportedly scoring him hundreds of millions of dollars while his father was in office.

Schweizer pointed out in his book that these shady deals tended to take place in the “dark corners of the world” where they would receive less scrutiny.

With the election of his father as vice president, Hunter Biden launched businesses fused to his father’s power that led him to lucrative deals with a rogue’s gallery of governments and oligarchs around the world. Sometimes he would hitch a prominent ride with his father aboard Air Force Two to visit a country where he was courting business. Other times, the deals would be done more discreetly. Always they involved foreign entities that appeared to be seeking something from his father. Often, the countries in question, including Ukraine, Russia, and Kazakhstan, had highly corrupt political cultures. In short, Hunter Biden was not cutting business deals in Japan or Great Britain, where disclosure rules and corporate governance might require greater scrutiny. These were deals in the truly dark corners of the world.

In addition to Hunter, according to Schweizer, Joe’s younger brother James Biden also scored big during the Obama years, flourishing in a field where he too had little to no expertise.

Consider the case of HillStone International, a subsidiary of the huge construction management firm Hill International. The president of HillStone International was Kevin Justice, who grew up in Delaware and was a longtime Biden family friend. On Nov. 4, 2010, according to White House visitors’ logs, Justice visited the White House and met with Biden adviser Michele Smith in the Office of the Vice President. Less than three weeks later, HillStone announced that James Biden would be joining the firm as an executive vice president. James appeared to have little or no background in housing construction, but that did not seem to matter to HillStone. His bio on the company’s website noted his “40 years of experience dealing with principals in business, political, legal and financial circles across the nation and internationally…” James Biden was joining HillStone just as the firm was starting negotiations to win a massive contract in war-torn Iraq. Six months later, the firm announced a contract to build 100,000 homes. It was part of a $35 billion, 500,000-unit project deal won by TRAC Development, a South Korean company. HillStone also received a $22 million US federal government contract to manage a construction project for the State Department. David Richter, son of the parent company’s founder, was not shy in explaining HillStone’s success in securing government contracts. It really helps, he told investors at a private meeting, to have “the brother of the vice president as a partner,” according to someone who was there.

Frank Biden is also accused of using his older brother’s political clout to his financial advantage, according to Schweizer.

When Biden became Obama’s point man in Latin America and the Caribbean in 2009, he traveled to Costa Rica for a rare and symbolic with the Central American nation. A short time later, Frank secured a big development deal to build a resort in the country.

Joe Biden’s trip to Costa Rica came at a fortuitous time for his brother Frank, who was busy working deals in the country. Just months after Vice President Biden’s visit, in August, Costa Rica News announced a new multilateral partnership “to reform Real Estate in Latin America” among Frank Biden, a developer named Craig Williamson, and the Guanacaste Country Club, a newly planned resort. The partnership, which appears to be ongoing, was wrapped in a beautiful package as a “call on resources available to the companies and individuals to reform the social, economic and environmental practices of real estate developers across the world by example.” In real terms, Frank’s dream was to build in the jungles of Costa Rica thousands of homes, a world-class golf course, casinos, and an anti-aging center. The Costa Rican government was eager to cooperate with the vice president’s brother.

Another member of Biden’s family who took advantage of Biden’s term in office is Howard Krein, who is married to the former veep’s youngest daughter, Ashley.

Krein is the chief medical officer of StartUp Health, an investment consultancy based out of New York City, which barely had a website in June 2011.

StartUp Health was barely up and running when, in June 2011, two of the company’s executives were ushered into the Oval Office of the White House. They met with President Barack Obama and Vice President Joe Biden. The following day, the new company would be featured at a large health care tech conference being run by the US Department of Health and Human Services, and StartUp Health executives became regular visitors to the White House, attending events in 2011, 2014 and 2015.

According to Schweizer, Biden leveraged his political power to his family’s financial benefit during his years in the Senate, as well.

Joe’s sister Valerie ran all of his Senate campaigns, as well as his presidential runs in 1988 and 2008. But she was also a senior partner in a political messaging firm named Joe Slade White & Company; the only two executives listed at the firm were Joe Slade White and Valerie. The firm received large fees from the Biden campaigns that Valerie was running. Two and a half million dollars in consulting fees flowed to her firm from Citizens for Biden and Biden For President Inc. during the 2008 presidential bid alone. Joe Slade White & Company worked for Biden campaigns over 18 years.

Schweizer appeared on Fox News host Sean Hannity’s radio show to discuss his new book and explain how Biden’s name became a boon for his family.

Schweizer, who has made a career out of exposing government corruption in Republicans and Democrats alike, said he’d never seen anything quite like “the Biden Five.”

“I’ve never seen a circumstance where it is such a family affair—as to where you have five members of a family who are profiting this way off of government service,” he told Hannity.

The author said that the corruption seemed to be part of a pattern that involved “basically the entire family.”