Starting at 6:30, Valerie Plame Wilson will discuss her life as detailed in her new autobiography, Fair Game: My Life as a Spy, My Betrayal by the White House.

Afterward, guests can buy copies and get them signed.

Plame Wilson's identity an undercover operative was disclosed by columnist Robert Novak in 2003.

Suspicions were that someone in the White House leaked the information to Novak in an attempt to retaliate against her husband, Joseph, a former ambassador who had accused the administration of exaggerating evidence of an Iraqi nuclear-weapons program.

President Bush cited that evidence in supporting the invasion of Iraq.

A federal investigation of the leak led to the trial and conviction of I. Lewis "Scooter" Libby, Vice President Cheney's chief of staff, on charges of perjury, obstruction of justice and lying to investigators.

Plame Wilson officially retired from the CIA two years ago.

Trudy Rubin, the Inquirer Worldview columnist who wrote extensively about the subject as it was unfolding, will moderate the event.

"The outing of covert CIA agent Valerie Plame Wilson by Bush administration officials remains one of the most disturbing stories connected to the Iraq war," Rubin said. "So it will be interesting to discuss with her some of the unanswered questions about the affair."

As of this morning, tickets were still available for the event. The cost: $12 for members, $15 for nonmembers, $6 for students (through 12th grade) and teachers.

Reservations are needed. Call 215-409-6700 or visit www.consititutioncenter.org to buy tickets, find directions or get more information.

The National Constitution Center is at 525 Arch St. on Independence Mall.