A single strand of red hair, coiled like a comma on the sorting table.Then a letter that smells of honeysuckle — addressed in her sister's careful hand.For seven years, Clara Wainwright has sorted the mail nobody could deliver.Letters to people who moved, died, vanished.Stories the world wrote with hope and then swallowed whole.She knows the rules.She breaks them all the same when she slides her opener under Lucy's seal.Clara,If you get this, I'm in trouble.I know about the packages. The ones routed through the dead letter system, the ones that never get recorded.It's worse than goods, Clara.Don't trust anyone at the office.Someone buried that warning in the orphan pile, where Clara was never meant to find it.Someone who knew her name, her old address, exactly where she worked.Then a scream cuts through the basement.Inspector Griggs is on the storage-room floor, a four-pronged mail hook driven through his chest — the kind that hangs from the ceiling, the kind they use every single day.The same inspector Lucy swore she'd tried to warn.Now a limping, cigarette-smoking detective named O'Donnell wants to know why a clerk is so calm beside a dead man.Now ambitious Celeste White, all cherry-red cloche and a smile that never reaches her eyes, is watching everyone.And now Lucy is missing, the office is sealed, and the one person Clara can't afford to trust might be the one signing her paychecks.To find her sister before whoever silenced Griggs finds her first, Clara will have to read the letters this town wanted lost — and learn that the neighbor no one suspected has been hiding in plain sight all along.Every dead letter holds a secret.This one holds a murderer.Dead Letter Office is a charming, shadow-edged cozy whodunit about a missing sister, a small-town murder, a hidden smuggling ring, an unlikely amateur sleuth, and the neighbor no one suspected.Perfect for readers who love cozy mysteries with a noir edge, plucky amateur sleuths, twisty whodunits, period small-town settings, and a murder that hits close to home. A standalone mystery with a satisfying solution.