Jacklynn Barton was the best interrogator of the NYPD. In truth, she was the go-to girl when the department wanted to get the Intel out of somebody. She was often called the "Encyclopedia" because she soaked up information like a sponge.

And it was true. She proved that at a young age that she had the uncanny ability to remember anything she had seen, heard, felt, thought, and even tasted.

This quickly proved to be both a blessing and a curse.

As Jack and her brother, Clint, grew up, they were fully aware that they were on S.H.I.E.L.D.'s radar. Both received full invitations to join. One accepted, and one declined under slightly suspicious circumstances.

But she was still a blip on the radar.