When Christina, Grant and their two friends join their mystery-writing Mimi (and Papa!) on a trip to the âMile-High Cityâ of Denver, Colorado, they soon find themselves:
⢠Sleeping in a mysterious, haunted palace of a hotel!
⢠Deciphering mountains of clues to solve a mystery!
⢠Reading tattered old books to help solve the clues!
⢠Traveling through tricky tunnels to get to a scary ski slope!
⢠Meeting an amazing woman who once sailed on the Titanic!