Sandy Grimes on How the CIA Rooted Out Soviet Spy

"The Assets" depicts the real-life investigation to uncover one of America's most notorious traitors.
3:00 | 01/02/14

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Transcript for Sandy Grimes on How the CIA Rooted Out Soviet Spy
It's a story -- sounds as if they could play out in a spy novel but for former CIA agent sandy Grimes under -- who betrayed American assets in what was then the Soviet Union. Was the real thing drama plays out of the new ABC -- here is the asset. And ABC's Karen Travers sat down with Grimes to reveal Howell -- -- -- April 1985. The CIA agent walk through the front door of the Soviet embassy in Washington DC. My name is -- damaging. I work for the CIA. He offered intelligence information and demanded payment. The assets -- mini series starting tonight on ABC shows us what -- aims to betray his country. And become one of the worst traders in US history. -- first contacted. Police have rounded up next. All of the human assets CIA had worked there lost more assets in the last three months -- -- practically any other time in our history. -- -- it's practiced communications codes. Security here they -- a traitor to think that she would never happen trader in an organization in this. That he. Kinney Grimes was -- CIA counterintelligence officer she wrote the book the assets is based on and is one of the main characters -- miniseries. The agency began an investigation -- 95. They didn't go anywhere in 1990 Wanda Grimes in a small group there were asked took a second look and and blew out animal and we felt so strongly. That. It almost became a crusade. From a list of 160 -- they narrowed it down to about a half a dozen -- emerged as the prime suspect. More than a year later that -- means that the Soviets to financial transactions. Grants that are current or -- it was that your -- moments after it burst into his office shut the door. -- said it doesn't take -- rocket scientist to figure out what's going on here. -- -- -- -- -- -- Angels arrest in 1994 pleaded guilty to spying. He's now serving a life sentence in federal prison Karen Travers ABC news Washington. The series premiere of the assets -- tonight -- -- starting at 10 PM.

This transcript has been automatically generated and may not be 100% accurate.

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