The Darkdeep is a very entertaining plot about a mysterious island in a small town. It's about a trio of friends (Nico, Emma, and Tyler) who, partnered with the popular girl (Opal), jointly venture to the strange island where there are tons of rumors and legends about it. They find that the island contains a large boathouse, complete with strange artifacts and a mystical pool. Emma falls in the pool, finds herself waking up at the shore of the island, and discovers her imaginary friend from when she was young came to life for a few seconds on the island. This insane event makes them discover that they can temporarily bring whatever thing (Minions, Godzilla, stormtroopers, etc.) is on their mind to life on the island. While it's fun at first, the figments of their imagination start to last longer and become more aggressive. The group struggles to keep the island a secret while things get worse. This book is surprisingly interesting and engaging, and its plot is well thought-out and its characters are mature yet realistic.