The return of Moriarty

Months after Sherlock Holmes' untimely death, his nemesis James Moriarty is attempting to rebuild his criminal empire. Meanwhile, Clara Mendel, a young doctor, is returning after a long absence to Schloss Alber, a vast estate uniquely situated high on the cliffs of Bavaria. The noble family who live there are facing certain ruin if they cannot recover a priceless sword - an inheritance stolen from the safest place on the estate : the grave of Clara's stepfather.
Lord Alber has asked Mr Hugo Strahm, a new acquaintance, to find the sword and restore the family's reputation. But Clara isn't naïve. She knows the secrets a great house like Schloss Alber can hide. And as she spends more time in Mr Strahm's company, she begins to suspect him of hiding his true identity. Can she really trust him to find the missing sword ?