The Heroes were late, if they were ever going to show at all.
Summerhaven is in crisis, the kobolds have over-run the surrounding areas whilst a strangle is about to be placed on the little town. Once a lively little place, now a pocket of civilisation on the verge of extinction.
But then Heroes do have a habit of showing up at the right moment, just when you least expect it. Though, you can't really be considered Heroes if you haven't actually saved the place yet. You might just be some wandering adventurers who had the fortune of being caught in the shadow of the keep.