Adi Rule’s engrossing fantasy book “The Hidden Twin” takes place in a city situated on the edge of the massive volcano Mol. A Redwing a nameless girl has been kept secret in an attic room for eighteen years. Jey her sister is an only child who leads a public life. A cult and underground rebels become interested in the concealed girl when she unintentionally awakens dormant powers by switching places with her sister. She has to decide which course to take to save her sister and her house when myth and history collide.