Because there are 2 pipers and if leo gets hurd they dont care. How must phoebe and paige solf this they have to save leo and piper as well.
One of the 2 pipers is very serious but the other party the whole night.

If you have read the other charmed books you will get the story but you can also begin to read this book at first.
I dont have read it out jet but it is a very cool and mysterious book, just like the other books but this book ghose over piper not many books are over piper.