Night in "Al-Farhad's Pearl"

From the introduction: Al-Farhad’s Pearl is the beautiful oasis in the middle of the Wicked Desert trade route. It is the only place where occasional wanderers and merchants can rest safely after hard and dangerous travel. There is a comfortable caravanserai of the same name near oasis. Under building basement lies secret slavers base. And sometimes careless and tired oasis visitors disappear right in the middle of the night...