"Since her twin brother, Eddie, drowned five years ago, sixteen-year-old Elsie Main has tried to remember what really happened that fateful day on the beach. When cute, mysterious Tay introduces Elsie to the world of freediving, she vows to find the answers she seeks at the bottom of the sea." -- Provided by publisher.

"Gracie loves snorkeling! She loves it so much, she convinces her parents to let her plan a family vacation to Roatán, Honduras, where they can all snorkel together. She even makes a new friend there. Now, if only her irritating little brother would leave her alone, everything would be perfect. Then Gracie hurts her leg, and all her carefully made plans start to come apart. Worse still, she learns the reef itself is in serious danger. Gracie wants...

"Humans use machines to explore the ocean-from snorkel gear to submersibles-and they ask, "How deep can we dive?""-- Provided by publisher.