The demon who was mistaken. Book 5. de Camp L.S.

The world of demons is in danger. Its inhabitants urgently need iron, and it can only be obtained in human reality. In exchange for the treasured metal, they send to the ground the young demon of Zdim. For a whole year he should serve people and fulfill their orders.

The demon was sure that he would cope with this mission, because it was not for nothing that he taught the language of people and their traditions in college. But the theory often diverges from practice, and it seems that Zatim did not calculate his strength. Everything, for whatever he took up, ends with a real disaster.