As the chill of winter sets in, the joy of Christmas is shadowed by a series of mysteries that will test Lord and Lady Percy like never before.

Alnwick, Northumberland, 1813: Lady Percy's worries about spending her first holiday season as a new countess grow worse upon their arrival at Alnwick Castle. When the old duke calls her by the wrong name, she is left with unsettling questions: Who was this mysterious woman in the duke's past, and why does his fading mind cling to her memory so fiercely?

Meanwhile, Lord Percy confronts a crisis outside the castle walls. Children are disappearing from neighboring villages, vanishing without a trace into the Northumberland wilds. Determined to put an end to the parents' suffering, he heads a search party, risking all to find the missing before winter's grip turns deadly.

As they each delve deeper into their separate mysteries, Lord and Lady Percy are drawn into a web of secrets that stretch back through the ducal line. But with shadows closing in on Alnwick, time is running out. Can they uncover the truth before another child goes missing in the night?

The Emerald Threads weaves holiday tradition with dark intrigue in a Regency mystery that will keep you turning pages late into the winter night.