The best mouse traps are still the old school snapping ones. They're not sensitive enough right off the shelf though. Take some pliers and bend the trigger just a touch more to give it a hair trigger. Find out where the mice come from, probably the heating vent or some other tiny hole, and line them up so the trap is flush against the wall in a perpendicular fashion, with the trigger on the wall side. Those assholes will die.
12/22/14 at 1:07pm