Animorphs #5: The Predator

In this story, Marco wants to quit being an animorph.  But now he has changed his mind because he now knows Visser One is his mother!  Marco is very sad when he sees his mother for the first time since he thought she died, and now she is the host body of Visser One.  I liked this story because Marco finally finds his mom.  If I was transported into this book, I would try to help Marco get his mom back.