"Here's an easy one for you," said Scheherazade. "Good" said the Sultan. "I'm not in the mood for thinking too much this evening." "A theft has occurred. Someone has stolen a jewel from Ali's store. There are three suspects, Nedim, Suad and Rashad, one of whom is guilty. The guilty party's statement is true, the other two are false. Here are the statements:
Nedim: Suad stole the jewel.
Suad: What Nedim says is true.
Rasheed: What Nedim says is false.
Inspector Ahmed Marouda, of the Baghdad police, soon finds the culprit. Who was it?"
(Acknowledgement to Raymond Smullyan)

If Nedim is telling the truth, then Rasheed is too, which isn't possible since only one is telling the truth. Thus Nadeem is lying. It then follows that Suad is lying and Rasheed is telling the truth so it must be him.

Well worked out nautilator. The Sultan was successful too.