I believe this is my first comment on this site, but I have to. The idea is good. Could likely use some fleshing out, but others have already expressed some points of improvement and I don't want to be redundant. I just wanted to say that this was a very entertaining read. Also, the observation that the long-lived elf would spend more time in basic training was so obvious I wonder how I've never run across it as such. Bravo. Go to Comment
The player characters, experienced and somewhat well known, hear rumors and travelers' tales about a distant area being overrun by dragons (or other terrifying monstrosities). The locals have sent them a message, begging for heroic aid.
When they investigate, they discover that nothing of the sort is going on. It turns out that a group of thieves wanted them out of the way so that they could rob them (or someone who would normally receive their protection).