One night last March, days into the war with Russia, a body was dumped on a cold sidewalk

in central Kiev.

His face is covered with bruises and it's bloodied.

One of his legs has been shot and there's a tourniquet on it.

His wrists are reddened as though he's been handcuffed and there's a bullet all in the

back of his head.

It was the body of a 45-year-old Ukrainian banker named Denise Karev.

And very soon after, there were claims that this gentleman had been a spy for the Russians,

a Ukrainian national working for Moscow.

These claims, in local media and biolomaker, alleged Karev was a traitor.

But days after the killing, officials offered a different narrative.

They said, oh no, actually Karev was working for Ukraine and he was a hero to his country,

something that's directly an opposite story.

That really just left everybody perplexed.

Collecting stories about a dead spy didn't just present a tantalizing mystery.

Our colleague Brett Forest says they revealed a war within the war.

What Denise Karev's story unlocks for us is the entire landscape of Russian infiltration

throughout Ukrainian society and how this weakened Ukraine's resolve over the years to defend

itself and its ability to defend itself.

Brett had a burning question.

Whose side was Denise Karev on?

Had he been working for Moscow as a spy?

...