The Lost Post - A Hopeful Mystery of Lost Letters, Found Family, and Second Chances

Wren Halloway walks the coast delivering letters nobody else could find a way to send. The one letter he's never delivered is his own. When Wren inherits the satchel and the job from the only mentor he's ever had, he thinks he already understands every shape grief can take on the road he walks. Then he finds a letter at the very bottom of the bag that was never meant to be found: sealed, decades old, addressed to nothing but two initials, and clearly never meant to be opened by anyone at all.
His mentor won't explain it. He's told, flatly, to leave it alone. But Wren has spent his whole career being the one person who refuses to give up on lost things, and the longer he carries this letter, the more certain he becomes that whatever's inside it was never simply forgotten. It was hidden. On purpose. By someone who's spent decades making sure nobody, including Wren, ever got close enough to ask why.
The closer Wren gets to the truth, the harder it becomes to ignore what his own instincts are telling him: nothing about this was an accident. Somebody buried this on purpose, buried it so well that fifty years passed without a single person working out why - and now Wren is the only one left who's noticed, the only one still asking, running out of road before the answer disappears again, maybe this time for good.
But every mile he walks chasing down somebody else's fifty-year-old silence brings him back to the one question he can't outwalk, no matter how far the coastline stretches ahead of him: if he's brave enough to hunt down a stranger's buried secret, why can't he find the nerve to send the one letter that's actually his to send?