Originally Posted by Lady of the Lake

On her way to find the trolley lady, coming from the back of the train, Ariadne passed by a compartment with only one occupier, and a familiar one at that. The fifth year remembered having chatted with Arabella-Marie at Hogwarts before. Did she seem sad?

Deciding to step in, Ari knocked on the compartment door and mouthed a 'May I come in?'. Without waiting for an answer, she entered and crashed on an empty seat next to her housemate. 'Is everything all right?' Just checking.

'I've read about you this summer.' Ari felt the need to say. 'I found an Aparecium parchment in my box of Bertie Bott's. What WERE you doing close to Knockturn Alley?' the girl began to whisper. Aparecium was supposed to be secret, right?