Partly by hosting parties, the married Kelley became a kind of social ambassador for nearby MacDill Air Force Base and got to know high-ranking military officers, including Petraeus and his successor in Afghanistan, Gen. John Allen.
Reportedly, Broadwell suspected that Kelley was putting the moves on both generals, and sent emails threatening Kelly and warning Allen about her.
Alarmed, Kelley took the threats to the FBI, whose investigation led the married Petraeus to acknowledge an affair and resign from the CIA.
Numerous email exchanges between Kelley and Allen were also investigated, with some reports characterizing them as "inappropriate" and "flirtatious."
Allen's nomination to become NATO's supreme allied commander has since stalled, and early this week, Gen. Joseph Dunford assumed command of the forces in Afghanistan.
The Post, quoting unnamed "friends" of Kelley's, said the book would be " 'payback' for the public humiliation she's suffered as a result of the scandal."
Kelley, born Jill Khawam, grew up with twin sister Natalie and two older siblings in Northeast Philadelphia, later moved to Huntingdon Valley, and still lived in the area as a young adult.
Natalie, who got a graduate degree at Temple before becoming a lawyer, also got caught up in the scandal, with reports that she sought Petraeus' help in a custody battle. Natalie Kelley even hired noted celebrity attorney Gloria Allred to help deal with the media and supposed public misconceptions.