Ruby

From google book review - "Ruby was made in 1934 by Austin Motor Company—she's shiny, she's beautiful, and this is her story Gorgeously illustrated with pictures so intricate they can occupy readers for hours, this is the story of Ruby, a beloved vintage car that once belonged to author Colin Thompson in real life. While flipping through the pages of the lavish interior, enjoy all the colorful details, but be sure to pay attention! There are clues to the six letters and numbers that make up Ruby's license plate number hidden throughout the book, and readers are encouraged to join in on finding them as they learn where Ruby comes from and what makes her unique."