From Infinity Scan:

As a child, Maria would tell a story about the Orgel to Sara. A story that seem to be out of this world. On that night, Maria intrusted Sara with a special gift, the Orgel. Although, Maria would like Sara to hear the tune from it but it was impossible without the key. It a gift that will lead her to unlock the Orgel one day and to find the place in the story that Maria had told her about. The academy in England where Maria resides...