firebug

The firebug stopped his car and ran around the first building, which appeared to be an old barn.

I've been over that thing time and time again, and I've felt like I was sort of a firebug myself sometimes.

Suppose that the firebug should run through the town while the foresters were climbing up to the roof to get that message.

The car was still there, but there was no sign of the firebug.