Jeremy "JB" Barnes is looking forward to spending the summer before seventh grade hanging on the beach. But his mother, a scientist, has called for him to join her aboard a research ship where, instead, he'll spend his summer seasick and bored as he stares out at the endless plastic, microbeads, and other floating debris, both visible and not, that make up the Great Pacific Garbage Patch. Miles and miles away, twelve-year-old Sidney Miller is trying to come up with an alternate activity worthy of convincing her overprotective parents that she can skip summer camp. When Jeremy is asked to find the contact information for a list of important international scientists and invite them to attend a last-minute Emergency Global Summit, he's excited to have a chance to actually do something that matters to the mission. How could he know that the Sidney Miller he messages is not the famous marine biologist he has been tasked with contacting, but rather a girl making podcasts from her bedroom-let alone that she would want to sneak aboard the ship?