Keeper of the Lost Cities #4: Neverseen by Shannon Messenger

My name is Fitz, and my friends and I have left our homes to join the Black Swan. Mr. Forkle says Sophie and I can connect to make our telepathic abilities more powerful, but we're still learning how. The Neverseen and ogres have spread a deadly virus among the gnomes, but Forkle won't let us help him find the rebels. We've run out of clues and may need to sneak into dangerous and forbidden places. Keefe's afraid he may follow in his mom's footsteps to help the enemy, even though he's been my best friend for years. It's hard getting information without being caught, since we've been banished. We've been surprised by the true identities of some Black Swan members, but we were shocked to discover secrets behind the plague. War may be imminent.

This book picks up immediately where the third book ends, so you'll need to read the previous books first. There are a total of six in the series. Sophie is still the main character, and others continue to say she's the key to everything. The author allows characters to expand their powers with Black Swan training, so that keeps the plot interesting. Biana perfects her invisibility, and Dex creates some handy technology used to hack files and defend his friends. The Black Swan presented the answers to questions that have been lingering since the series began. How was Sophie created? What's behind the conflict between the elves and ogres, and why have the gnomes been targeted? The author continues the mystery of the Neverseen, although this book reveals their motivations. She also manages to save another huge surprise for the end of the book that will make you eager to read the sequel. I recommend you start this series right away!