Okay, so imagine you have a really cool costume and you want to go to a party. But you don't want anyone to know it's you in the costume, you want to pretend to be someone else. That's kind of what this book is about.
In the story, there is a group of friends who are all pretending to be different people at this big fancy party. They dress up in costumes and wear masks to hide their true identities. They all have different reasons for why they want to pretend to be someone else, but they all end up getting wrapped up in a big mystery.
The mystery is all about this guy named Ash, who is supposed to be dead. But some people think he might still be alive and hiding out at the masquerade party. So the friends start snooping around and trying to figure out what's really going on.
There are a lot of twists and turns in the story, and things get pretty intense at times. But in the end, they all figure out what's really happening and solve the mystery together.
So basically, masquerade is a book about a group of friends who dress up in costumes and pretend to be different people at a fancy party. But there's a big mystery to solve, and they end up getting caught up in all kinds of crazy adventures before they finally figure out what's going on.