Chronicles of Narnia (Book 5)?

I have an issue...I'm borrowing my friends book set of this series and I am on number 5. Long story short, my dad has my car, i have his..all the stuff in my car that was not to be thrown away was in a bag set aside..my dad later took it for trash...and it is gone forever now....is there anyway i can buy just the book five that goes with this set instead of buying the whole thing?