Joel and Theo haven’t spoken since the summer they turned sixteen, but that’s about to change.

From the outside Joel looks like the picture of success: a TV scriptwriter with a smash hit who’s still together and in love with his teenage sweetheart, Amber. But he's falling apart at the seams. He's headed home to reconnect with best friend Theo--to get back to the start of it all.
 
Theo has been living in his parents' shed, nursing a broken heart and a wounded ego, convinced life can't get any worse. Then he gets evicted on his 30th birthday. He thinks he's done with the real world - until it shows up on his doorstep...

One of them is keeping a secret, and the other is living a lie. But can the promise they once made to walk all 184 miles of the Thames Path help them find their way back to the truth--and to their friendship?