The silence wasn't unwelcome; Hermione took the chance to collect her thoughts, musing once more over the events of the day. She reached no new conclusions, of course; she'd had the entire train journey to mull it over before, and had learnt very little since.

"Oh," she said in response, sounding wry, "the basics. Unsavoury characters about, eldritch fog surrounding us..." She gave Martha a sidelong look. "And something about a prison ship. He likened it to Purgatory."