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Our story tonight takes us into the secret of illegal

and lucrative world of insider trading.

Our guide is a former stock market analyst named Rumi Khan.

She made a fortune in illegal profits before she was caught

and became a government informant

in one of the biggest insider trading busts in American history.

Two people knocked on my door and they flashed the badge

and my hot sank because I just was like, oh my god.

You are a senior advisor to the president,

but you are also his best friend.

I can't think of another example in a White House

where there's been that kind of relationship

since Bobby Kennedy and President Kennedy.

It's a very unusual role.

Valerie Jarrett is the only White House advisor

who at the end of the day regularly joins the president

in the private residence.

She says she keeps the personal and political separate,

but she earned the unflattering nickname Night Stalker

...