Paul Skalnik was a prolific and ruthless conman and abuser. For more than three decades, he passed himself off as a Vietnam veteran, a college football star, a high-rolling oilman, a criminal defence attorney, an undercover FBI agent and a terminally ill cancer patient. From 1977 to 2015 he was incarcerated many times over and repeatedly used as a jailhouse informant. His bogus witness testimonies of cell confessions have sent at least four men to Death Row.

During a year-long investigation for the New York Times Magazine, Pamela Colloff determined that Skalnik was one of the most prolific, and most effective, jailhouse informants in American history. For decades he was considered the state prosecution's 'closer' witness who could smooth over a case's inconsistencies, nudging jurors past reasonable doubt.

Whenever he was released from prison he would continue his crime spree in which women were usually the collateral damage. Over four decades he was charged with 32 felonies including larceny, fraud, grand theft, the unauthorised practice of law, bail jumping, bigamy and lewd conduct. He married at least nine different women, some at the same time, and was a serial abuser of young girls.

The narrative is framed by the botched investigation of James Dailey - tried with the murder of 14 year-old Shelley Boggio. Skalnik's witness testimony helped put Dailey on Death Row.

By recounting Skalnik's lurid life, Pamela Colloff tells a larger story of injustice and the trail of broken lives he has left behind.