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Why not? I think traditionally people maintain contact with their families, and we were not convinced that she had not.

That's Stephen Shearholt, retired BCI agent who eventually became Greg Costas' boss. Shearholt remembers that as long as Margo's fate was still unknown,

Costas wouldn't stop until he found the answer.

Greg was like a dog with a bone.

Call it ego or call it grit, but Costas believed no secret could resist him forever.

Every cop before him had pressed her relatives, hoping for a crack.

But every attempt had collapsed into silence.

So Costas knew he'd need a different way in.

I thought, why couldn't I impersonate the baby that she gave up for adoption in 1966.

Costas was 27 at the time.

The exact age the baby would have been.

It was a coincidence he could use, the perfect cover for getting close.

And since the real child had been adopted as an infant, it's not like anyone would know what he grew up to look like.

And I could approach the family members saying, hey, this is who I am. I'm trying to find my birth mother, Margo Freshwater.

This was a pretty bold plan. Ethically blurry for sure.

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