I wanted to help out with your story here, and I had some OpenAI credits available, sooooo here's a high level chapter summary, straight from our AI Overlords. I'd give it 2/5, too much microphone.

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Plot: A bunch of kids from MIT or CalTech or where ever decide to bug yachts. They get unassuming jobs as deckhands and stewards to give themselves time to install devices like this DIY boat monitoring system along with microphones behind all the panelling around the yachts which are owned by CEOs of major companies. More or less, the device caches all the audio recordings and waits for the ship to enter a marina where it connects to wifi and sends the information home. They are looking for stock trading information, mostly. They are in the Caribbean maybe in St. Martin and overhear some nasty things by the Russian mafia. Someone made a mistake and they get caught. That's the beginning. The rest of the novel is a bunch of nerdy kids having to MacGyver their way out of the Caribbean while being chased by the most powerful and dangerous people on Earth.

Chapter 1: ____ is on a yachting trip in the Caribbean. He gets a message from his friends on shore telling him they've been caught and are on the run. He has to decide whether to try and help his friends or try and get off the boat and call the authorities.

Chapter 2: ____ decides to help his friends. He needs a weapon, so he builds a crossbow from materials he finds on the boat, and he needs to learn how to use the weapon. He also needs to know how to defend himself in hand-to-hand combat, so he takes some of his friends' martial arts training. To learn how to use the crossbow, he goes to a nearby island where he has to steal or purchase a target.

Chapter 3: ____ steals a target from a competitor. He then goes back to the yacht and practices using the crossbow on the target.

Chapter 4: ____ goes to a nearby island to look for a drink to help him stave off seasickness. While there, he meets a young girl named ____ who is a pickpocket. She also teaches him some thieving skills.

Chapter 5: ____ returns to the yacht. He needs to make a plan for the next day. The yacht is going to be in a marina to drop off the CEO of a company who is on the yacht and ____ needs to decide what he's going to do with the microphone. He also has to spend some time learning to use the microphone in case he decides he wants to stay on board.

Chapter 6: ____ decides he is going to stay on board. He spends the next day learning how to use the microphone and listening to the CEO of the company. The CEO gets a call from the Russian mafia, who are threatening to kill his family unless he gives them the company. The CEO gives them the company. ____ decides to stay on board after overhearing this conversation.

Chapter 7: ____ has to make a plan for the rest of the trip. He needs to decide when he's going to connect the microphone to the wifi so the information gets sent home. He decides to wait until they are docked in a marina. In the meantime, he has to continue learning how to use the microphone and the crossbow.

Epilogue: The whole point of the book is to show how these kids had lives that could have been, but chose to work for the government instead. I don't know. The ending was not at all satisfying.