So I'm looking for this fantasy novel but I don't know the name of book or the Author. All I know is it centers around a collage student who dad was a soldier and trained him to use guns swords knife how to survive. He comes home from collage to find his parents missing. He then he discover his parents went through a magical door leading to a magical kingdom. He finds out that his mom is a princess and uncle is a wizard and that his dad was brought over from real world to protect the magical kingdom. I think book was called varium memoirs but I think I'm spelling it wrong. Can one tell me the name and author of this novel actually it was like three or four of them.