Mystery on the Island

I read "Mystery on the Island" written by Rob Warning and Maurice Jamall.

"Why's the police officer telling a lie?" "Let's find out," says Tyler.
"Look. there's the boat," says John. "It's going to Shark Island. Quick. Let's go and look." 
"How can we get there?" asks John. "Let's go in our boat," says Daniela. "We must find her. We must help her."

 The main characters in this story are Daniela, David, John and a woman. When they were on their way to the music shop, suddenly a big white car passed by them at a very fast speed. The speed of the car almost made Daniela being splashed with water. The speed of the white car was so fast that they were curious and remembered the white car.  When they walked near the marina, they noticed that the white car was parked near the boat. When they looked at the car, they wondered and saw a well-built man coming out of it. He told them with an angry tone of voice that "Go away!". They were so surprised that they were about to leave quickly. And then they saw a woman being put into a boat. They thought the woman was involved in the incident and told the police about it. But when the police arrived at the marina, there was no boat and car there. They were got angry by the police, but afterwards, they continued to look around the marina because they were worried about the woman. And there they found the police and the well-built man who was angry and they were talking together.  What is this, and where is the woman?

I read this book, and I felt that their kindness lead them to their happy. Because the woman was a singer whom Daniela liked very much, so it is really happiness to her. If I see a unknown woman is in trouble, I don't know whether I can help her soon or I make action for her, or I do nothing. So they are strong!   

Vocabulary
・marina 【məríːnə】ヨットやボートを係留するための港