We expect our spies to be masterminds, but Aldrich Ames was the unremarkable bureaucrat asleep at his desk, the man who caused the execution of at least 10 people not for ideology but to pay for a divorce and fund his wife's 500 pairs of shoes. This episode examines how a mediocre CIA officer became the most damaging mole in American intelligence history and exposed a system blinded from the inside.

We trace his legacy hire status, the red flags ignored from a confessed bicycle theft to a briefcase left on a subway, and the financial desperation that pushed him to approach the Soviets in 1985. We cover how he passed polygraphs, his absurd cash lifestyle on a $60,000 salary, the human cost of betrayed assets like Dmitri Polyakov, and the murky gray areas that still baffle investigators today.

• How CIA compartmentalization and an ol ...