Unique Selling Proposing (USP)

So I am trying to come up with what it is known as a Unique Selling Proposing—a Tag Line or Elevator Pitch for "The Conjunction of the Realms."

These two sentences are my first attempt, and I was told that they were too Disney-esque, thus not "unique." Does anyone have suggestions or better ideas?

A thrilling and original adventure to the world of imagination for the entire family.

In this whimsical mystery novel written for all ages, Grandpa Kingsley takes his entire family along with the reader on an unforgettable adventure where imagination and reality collide.