Deltora Quest #3: City of the Rats by Emily Rodda. 

These books chronicle the quest for the gems of the Belt of Deltora. Only a true heir to the throne can wear the belt laden with these magical gems. There are seven gems in all, each wielding a great power. When combined, these gems protect the land from the evil Shadow Lord. Biding his time, the Shadow Lord waited until time and ignorance had diminished the rulers' powers. He then destroyed the belt and hid the gems in the most dangerous places throughout the kingdom.

Lief, Barda and Jasmine have succeeded in finding the golden topaz and the great ruby. The two gems' mysterious powers have strengthened them and given them courage to move on in search of the third stone. But none of them can know the horrors that await them in the forbidden City of the Rats.

This over-size paperback, of 120 pages, was in published by Scholastic Australia in 2002. 

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