The War of the Twins Book Two of the Shattered Earth Chronicles

In one of the many Shard Earths that inhabit the Shattered Earth universe, it has been but a few months since the Battle of Riftbridge, and Aiden is still prisoner of the malicious Zaphon. After making a deal with Zaphon that causes utter chaos, Aiden escapes and flees through the city, where a member of the growing resistance shelters him. Aiden's younger siblings, twins Emma and Emrys, seek a healer. Emma spends her time studying the Sword Dance, a secretive martial art under the tutelage of her mentor. Emrys soon awakens, and when he does, shares a vision. This vision seems to coincide with a prophecy about the coming of three champions from another world ... Of course, those who would cruelly seek to rule are not happy to hear this, more afraid than ever of Aiden and his siblings. Zaphon has begun an invasion of all the lands south of the Rift, and Aiden will need all the members of the resistance to help him win the fight against evil. Aiden's family may have won battles in the past, but the game has changed. It will take all their strength and goodness to be victorious again.