Lucy Greenwell

It's a bright autumn morning and I'm in the car with Jess, her husband Jamie and my producer, Katie.

We're heading to the Suffolk house where Jennifer lived and worked back in 1987.

For the first time, Jess's years of digging and my fresh investigation are coming together.

Before trying to answer questions about why Jess was left, we both want to understand how any of it was possible.

How did she hide her pregnancy, hide the birth, and apparently evade any suspicion at all?

So we want to get a sense of Jennifer's life back in 1980s Suffolk.

Jess is convinced that someone must have known that Jennifer was pregnant, maybe even helped her at the birth.

And for Jess, the most likely person is Selina, the mother of the family Jennifer worked for.

After all, Jennifer lived right there, under her roof.

So I'm taking Jess to meet Selina and her daughter, Gussie.

It's a huge moment for Jess.

She's got such scant details about her origins.

So this family and this house are really important.

She's thought about them for years.

Oh, look at the fluff!

Who's the fluff?

Let's not run the Pekingese over.

No, let's not do that.

We pull up on the wide gravel drive.

The big front door is propped open and a small Pekingese runs out to greet us.