Greg spent a very informative morning with Millie. He learned that there was a spell you could use to break into people's minds and read their thoughts, but that it was illegal. He learned that wizards had a potion that could force a person to tell the truth, but it was also illegal, and might not even work on muggles. Tracking spells, which were also illegal, were miles behind muggle methods anyway.
"I wish the law wouldn't get in the way of law enforcement so much," said Greg. "So what do we do?"
"Well," said Millie, "disguising yourself and following them around and asking their friends questions is always good. Especially with muggles because they won't be expecting it."
Millie cast a disillusionment charm on the pair of them, and they sidled up to the edge of the Hog's Head.
"This one seems strictly small time," said Millie, pointing out the rather disgusting man she was tailing. "Mundungus Fletcher. Mostly dodgy forgeries and robberies; he'd be beneath me if certain senior staff members weren't trying to show me my place all the time by handing me boring cases. We always thought Mundungus was on the muggle-friendly side, because he showed up at the Battle of Hogwarts. He might be in league with the remaining Death Eaters though, because we've seen them at a lot of the same places."
"Wait a minute!" said Greg. "That's him!"
"That's who?"
"Theodore Howeth, the bloke in this file here!" He showed her the funny non-moving picture.
Millie raised her eyebrows and examined the papers. "So, Mundungus Fletcher is posing as a rich old muggle with a murdered son ... why?"
Greg pulled down his sleeves. "Let's find out."