The Wailing Manticore

From the introduction: The Cave... ...lies high up the slope of a craggy mountain, rumoured to be the lair of a flying monster that steals shiny trinkets from passing merchants. Recently, a wailing howl has been heard coming from the cave, and local merchants want it to stop, for it is affecting their business. Any treasure found there can be kept by whoever is brave enough to venture inside, put a stop to the howling, and maybe an end to the monster too.