Two days later, Mina opens the library door with her usual cheerful smile.
"Miss Ver Susa - oh!"
Miss Ver Susa isn't at the desk. A young man with curly black hair and curly horns like her own looks up from the book trolley.
"Ah," he says, "you must be Mina Ren Atha. I am Master Tor Aven. I'm in charge of the library while Miss Ver Susa is away."
"A - away? What -"
"She's helping with an enquiry in the upper tier." He looks back down at the books on the trolley. "Please carry on with your work."