Five Kingdoms #5: Time Jumpers by Brandon Mull

My name is Cole, and it's inevitable that Ramarro will escape the Void and conquer all the kingdoms. My powers are slowly coming back since I've left the echolands, and I am the only one who might have a chance at stopping him. With the help of a Wayminder named Violet, I'm able to instantly travel anywhere in the Five Kingdoms with my friends Mira, Jace, and Twitch. We're searching for two Grand Shapers named Lorenzo and Kendo Rattan who are rumored to still be alive. Kendo created the Void, so he may have knowledge that can help us. However, Owandell controls the Enforcers, and they're searching for us everywhere. Now I've learned that I must travel back in time to get the information we need to stop Ramarro, if the information ever existed at all. 

I highly recommend you read all the other books in the series, or this one won't make much sense. A creative twist in the series is that different characters have unique powers, but they only work in specific kingdoms. Leave the kingdom, and the power leaves too. Cole has the ability to connect with other characters' powers and can neutralize or enhance them. Books dealing with time travel always need to address the paradox of characters' actions in the past changing events in the future. This book indicates characters might be able to change things in the past, but those actions become part of the past and don't affect the future. Confusing? It's really not. Previous books in series saw characters scattered across the Five Kingdoms, but Cole starts to reconnect with all of them. He's even able to reunite several princesses with their mother, although they all disappear. The castle personnel believe Cole and his friends are the kidnappers, so this adds another conflict to the mix. Ironically, the king and queen both endorse Cole's efforts, so it's strange to him become a suspect in their disappearances. Overall, this book was a nice conclusion to an exciting series.