Photograph by Nigel Parry.

Iput myself and my company at the C.I.A.’s disposal for some very risky missions,” says Erik Prince as he surveys his heavily fortified, 7,000-acre compound in rural Moyock, North Carolina. “But when it became politically expedient to do so, someone threw me under the bus.” Prince—the founder of Blackwater, the world’s most notorious private military contractor—is royally steamed. He wants to vent. And he wants you to hear him vent.

Erik Prince has an image problem—the kind that’s impervious to a Madison Avenue makeover. The 40-year-old heir to a Michigan auto-parts fortune, and a former navy SEAL, he has had the distinction of being vilified recently both in life and in art. In Washington, Prince has become a scapegoat for some of the Bush administration’s misadventures in Iraq—though Blackwater’s own deeds have also come in for withering criticism. Congressmen and lawyers, human-rights groups and pundits, have described Prince as a war profiteer, one who has assembled a rogue fighting force capable of toppling governments. His employees have been repeatedly accused of using excessive, even deadly force in Iraq; many Iraqis, in fact, have died during encounters with Blackwater. And in November, as a North Carolina grand jury was considering a raft of charges against the company, as a half-dozen civil suits were brewing in Virginia, and as five former Blackwater staffers were preparing for trial for their roles in the deaths of 17 Iraqis, The New York Times reported in a page-one story that Prince’s firm, in the aftermath of the tragedy, had sought to bribe Iraqi officials for their compliance, charges which Prince calls “lies . . . undocumented, unsubstantiated [and] anonymous.” (So infamous is the Blackwater brand that even the Taliban have floated far-fetched conspiracy theories, accusing the company of engaging in suicide bombings in Pakistan.)

In Hollywood, meanwhile, a town that loves nothing so much as a good villain, Prince, with his blond crop and Daniel Craig mien, has become the screenwriters’ darling. In the film State of Play, a Blackwater clone (PointCorp.) uses its network of mercenaries for illegal surveillance and murder. On the Fox series 24, Jon Voight has played Jonas Hodges, a thinly veiled version of Prince, whose company (Starkwood) helps an African warlord procure nerve gas for use against U.S. targets.

But the truth about Prince may be orders of magnitude stranger than fiction. For the past six years, he appears to have led an astonishing double life. Publicly, he has served as Blackwater’s C.E.O. and chairman. Privately, and secretly, he has been doing the C.I.A.’s bidding, helping to craft, fund, and execute operations ranging from inserting personnel into “denied areas”—places U.S. intelligence has trouble penetrating—to assembling hit teams targeting al-Qaeda members and their allies. Prince, according to sources with knowledge of his activities, has been working as a C.I.A. asset: in a word, as a spy. While his company was busy gleaning more than $1.5 billion in government contracts between 2001 and 2009—by acting, among other things, as an overseas Praetorian guard for C.I.A. and State Department officials—Prince became a Mr. Fix-It in the war on terror. His access to paramilitary forces, weapons, and aircraft, and his indefatigable ambition—the very attributes that have galvanized his critics—also made him extremely valuable, some say, to U.S. intelligence. (Full disclosure: In the 1990s, before becoming a journalist for CBS and then NBC News, I was a C.I.A. attorney. My contract was not renewed, under contentious circumstances.)

But Prince, with a new administration in power, and foes closing in, is finally coming in from the cold. This past fall, though he infrequently grants interviews, he decided it was time to tell his side of the story—to respond to the array of accusations, to reveal exactly what he has been doing in the shadows of the U.S. government, and to present his rationale. He also hoped to convey why he’s going to walk away from it all.