Season 4

Joe Astor returns to drive the new Viper when Thomas Cole is reassigned after blowing up the old Viper.

A small-time con artist helps Astor and Westlake catch a money launderer in an elaborate sting operation.

Astor infiltrates a security-tight mafia conference; a labor negotiator tries to seduce Westlake.

Astor falls in love with the wife of a Colombian drug lord while investigating the Blanca Noche cartel.

Astor and Westlake encounter a ruthless bounty hunter while trying to exonerate a man accused of murder.

Frankie bares all to uncover a blackmail-murder plot at a local strip club for women.

A former Israeli spy's new life is threatened when arms dealers kidnap his wife.

An apparent terrorist bombing camouflages an elaborate plot for an heir to claim her father's million-dollar pension.

Astor and Westlake try to locate a stolen cache of diamonds before some dangerous criminals take possession of them.

While staking out robbery suspects, Westlake finds out Astor isn't the man she thought he was.

After Catlett reads his brother's latest novel, fact becomes stranger than fiction as the plot line becomes real.

One of Westlake's old enemies resurfaces to exact revenge after escaping from prison.

Astor and Westlake go under cover as a married couple to expose a ring of diamond thieves.

Astor and Westlake try to stop a man who's plotting to kill his ex-wife for her jewel necklace.

After desperate bank robbers take Astor hostage, Frankie and Catlett try to track him down.

Astor and Westlake must unravel a conspiracy after the secret formula is stolen from a soda company and its owner is murdered.

Frankie befriends a self-proclaimed psychic who becomes involved in a plot to assassinate a senator.

Astor and Westlake must protect a spiritual ruler from a fated encounter with an assassin.

A series of deaths links to an old case, but someone does not want Astor and Westlake to reopen it.

A Japanese detective, in town to extradite an assassin, goes head-to-head with an international crime boss.

An electric shock causes Astor's brain implant to malfunction, turning him back into a criminal.

Astor agrees to have the brain implant removed; a distraught Westlake must focus on saving a kidnapping victim.