Book 17 - Maze Runner
Book 18 - Scorch Trials - both by James Dashner. Feels like a mix of Ender's Game and Hunger Games with much weaker writing. Will not recommend.
Book 19 - Shiver by Maggie Stiefwater. YA once again. Better than Maze Runner. Heavy Twilight influence.
Book 20 - Boy by Roald Dahl. Fantastic! And sweet and funny autobiography by the acclaimed children's writer.
Books 21, 22, 23 - Black, Red, White by Ted Dekker. Recommended by a friend. Somewhat interesting, but not strong writing.