The Family Secret. The Zero Enigma, #11

Kirkhaven Hall has been home to Isabella Rubén ever since she was sent into exile for treason.  It has always been a strange place; isolated, wrapped in dark clouds and ancient magics.  No one really knows what's hidden there, from eerie ghosts and warlocks to secrets House Rubén not only has kept from the rest of the world, but has itself forgotten.  They thought those secrets would remain buried for eternity. But now, as Isabella and her fiancé return from their holiday in Shallot, those secrets are starting to slip into the light.  Strange lights have been seen on the mire, ghosts have been walking the halls, ancient artefacts have been discovered and the ground itself, tainted by dark magics, is threatening to give up its dead  And, as Isabella finds herself caught in an ever-growing nightmare, it becomes clear that the disaster is not limited to Kirkhaven . .
And the magic crisis has only just begun.