"There are some things you should know about Harriet Wermer. She used to lie a lot, but not anymore. Seriously, she only tells the truth now. Even though she hadn't wanted to come to Marble Island in the first place, now she doesn't want to leave. It's the truth. With her mom and new baby brother home from the hospital, it's almost time for Harriet to pack up and head home from Marble Island and all the friends she's made. But Harriet doesn't have...

The spies head to New York City when a credible threat is made against a young climate activist.

"Eleven-year-olds Tripti Kapoor, a feisty "word nerd" from Massachusetts, and Sam Cohen, a shy, imaginative, budding geologist from California, are both miserable at Camp Dilloway, a summer camp in upstate New York. On the last night of camp, they follow a shooting star to a quiet creek. There they find two silvery rocks glowing in the night. They each take one home, and their long-distance friendship begins. It's soon clear that these are no ordinary...