Treason Keep and Harshini are the second and third books of the Demon Child Trilogy written by Jennifer Fallon. These young adult/adult fantasy novels are published by HarperCollins and are in very good condition. The narrative is in English and the intended audience is young adults and adults.

The books feature a captivating storyline about demons and are written in an easy-to-read format with a paperback cover. The original language is English, and the books were published in 2001. This is a great addition to any fantasy book collection and is an Australian-made product.