WJ, his sister Mindie, and their best friend Raj, want to dress up in something extraordinary for the school's costume day at the end of Book Week. They have to dress up like characters from their favorite book and decide on The Three Musketeers. But when they come across the perfect accessories for their costumes in a strange antique shop, things go horribly wrong. Now they are The Three Mosquitoes! And they have to survive a world of insects and monsters to find their way back home.