Two women who escaped the international drug trade and who are married to the highest level drug traffickers to become U.S. informants share never-before-revealed details about El Chapo, the Sinaloa Cartel, and the dangerous world of illicit drugs.

Drugs, money, cartels: this is what FBI rookie Scott Lawson expected when he was sent to the border town of Laredo, but instead he's deskbound writing intelligence reports about the drug war. Then, one day, Lawson is asked to check out an anonymous tip: a horse was sold at an Oklahoma auction house for a record-topping price, and the buyer was Miguel Trevino, one of the leaders of the Zetas, Mexico's most brutal drug cartel. The source suggested that...