Merlin was up on the second floor of the library when he heard Freyja come in. Just as well she was invited, or he would've had to turn the magical alarms off and that was just a pain.
"Up here," he called, looking down over the edge of the mezzanine floor, the book he was skimming through in his hands. "Hello, mistress of the Valkyries. It's been a while."