I hate when this happens....

I've written myself into a deadend. I've got the main characters, investigating a heinous crime, interviewing a fixer who provided the criminal with resources. The criminal is smart; he paid cash, gave his name as "Smith," and is only remarkable in that he's an Asian in London. I can't think of what to give the protagonists that will send them off to the next location. I could extend the timetable of the story, giving them additional criminal acts from which to gather evidence, but I think that might slow things down. I could make the criminal less smart, but I want him to be a shadowy figure that only raises more questions than he answers, and therefore he must be smart and cautious.

I could have an affiliated law enforcement character find information on another line of inquiry, because he's looking into a character that the criminal is using as a weapon (manipulating him into doing his dirty work). The problem is that that character isn't on hand to actually talk to anyone, and the manipulation consisted of commiserating with the "weapon" and then manipulating him into doing the task. There isn't a lot of ways that there could be evidence pointing at the criminal, especially since throwing in a sighting of the weapon with someone of Asian ethnicity seems a bit forced at this moment.

Anyone have any general ideas?

The Lakota withdraw from treaties with U.S.

Holy. Shit.

Can't wait to see how our government fucks this one up.