The Best of all Possible Worlds — Richard Parker

For seventeen years Gwaynn and Samantha have ruled peacefully over the lands of the Inland Sea as High King and Queen. All is well. The twins, Arnot and Avigail are nearly finished with their education on the Temple Islands. Over the years they have become Travelers, Scholars and rudimentary healers. Now they are ready for their final test, the test of Noble Island, where they will be under the tutelage of Tarina Vio Valencia.
Under the care of the famed Tarina, the twins will hone their fighting skills and be introduced to the subtle secrets of the Solitaries. From Vio, they will discover the very nature of time and space. It is a hard lesson to master, but the twins are excellent students and Avigail will lead the way. After her lengthy visit to the Far Lands, the legendary Galen Dawkins appears to Avigail in her dreams, pleading for her to find his world and protect him. Avigail quickly becomes obsessed with Galen, his world, and the danger that stalks him. She will stop at nothing to find him, to go to him and to save him.
With Arnot's help, Avigail believes she can bridge the gap between worlds and finally come face to face with the man that haunts her dreams. But when the twins surprisingly succeed in connecting the lands of the Inland Sea with Old Earth, events quickly explode out of their control. Avigail is torn away from her brother and thrown into the confusing and dangerous modern world, where her life is in constant peril. It is up to Arnot to summon the courage and use all of his power to find Galen's strange world and reunite with his sister.