Through the Mirror Pond (The Shattered Earth Chronicles, #1)

Zaphon, an evil and powerful tyrant, sets into motion a plan that he has been hatching for millennia. The earth is not what it seems. Long ago, near the dawn of time, the earth was shattered into countless shards of itself, each separated by a veil so thin that it can sometimes be pierced. Zaphon knows this quite well, and using dark, arcane arts he has caused fourteen-year-old Aiden to tumble though this veil from one world into another. Monstrous creatures capture Aiden, and he sees no way of escape. Now, Aiden’s younger brother and sister, twins Emma and Emrys, must find new friends and allies as they race against time to free their brother from Zaphon’s clutches. If they do not succeed, Zaphon’s wicked wish will come true, and the world will fall into darkness.