Five years ago, during a sweltering summer heatwave, perfect wife and mother Joy Maddison set off for her usual evening run – and vanished without a trace.

The final video of Joy, posted online by her devastated husband, has been viewed over a hundred million times. In the last frame she smiles for the camera, waves and says, ‘See you later, my darlings. Love you all!’, before turning to open the gate to the woods.

And then she was gone...

Now, on the fifth anniversary of Joy’s disappearance, in the midst of another oppressive heatwave, a chance sighting – a brief glimpse of blue-green eyes, that direct gaze, the curve of her mouth – changes everything.

Could Joy still be alive? And if so, why hasn’t she come home?