What if you've already crossed paths with the love of your life?

Cora and Jacob live in London's vast metropolis; he at one end of the Central Line, she at the other.

Their paths have crossed a thousand times without them knowing.

When a chance encounter on the underground brings them together, it seems they're destined to fall in love.

But although they live in the same city, their worlds are miles apart.

Jacob's life is uncluttered, while Cora's is full of complications. And as events begin to divide them, they start to wonder:

Are they meant to be together, or were they never meant to meet?