When Catherine Mae Snape goes to visit her father during her fourth year summer vacation, she finds a very different wizarding London. Starting with her having to stay at Number 12 Grimmauld Place, instead of Snape Manor for safe keeping. What will the Hogwarts students already there think of Professor Snape's American daughter? Will sahe be everything they expect of a Snape? Or not?

“How was your day, Darling?” He asked. “Perfect,” she replied. “First, I insult Granger by calling her Harry Potter’s girlfriend, then some crazy picture starts screaming at us, and called me a mudblood. I am not a mudblood.” “Of course you are not,” he said. “Just ignore her and Granger too, if you prefer.” “I wasn’t finished.”

“He needs help.” “Dementors are attacking him and another boy,” she replied. “A fat boy. And a woman.” “Should we really trust her?” Sirius asked. “Snape could have told her to do that so we’d rush out and..” “What put extra protection on Harry?” Lupin interrupted. “Not likely. Besides, I’ve seen Cat have visions before and that was just the way it happened.”

Lupin noticed that Severus’ hand was shaking as he held his wand out. This surprised him. Except for the time, Cat had fainted, and once more, when Snape had hugged her and kissed her forehead before leaving after a meeting, he had not seen him acting very much like a father towards her. However, whatever Severus was expecting to find in this mess had truly terrified him.