"I met a man named Jim, but he didn't give me his last name," John replied thoughtfully. "It might be the same man. There's also a man named Sherlock Holmes here who didn't come willingly, so there's four of us at the very least."
He shifted slightly to lean a little more on his cane as he grew thoughtful, frowning slightly. "It's odd, though. Prisoners aren't usually let wander around town freely. And what are we prisoners of? I've been back in England for a little while now, Sherlock was never a soldier, Jim works with computers... What did you do before you came here?" he asked curiously. There might be a common connection.