Trouble at the Beach by Chloe Donahue

Liza is so excited to meet a new friend at the beach. Gabby seems cool and is fun to be around. That is, until Gabby convinces Liza to come to the sand dunes on the opposite side of the bay with her. What starts out to be an exciting adventure, soon becomes dangerous. Gabby doesn’t seem like such a fun and friendly person to be around anymore. Will Liza and Gabby remain friends?