When tour director, Madeline Marlborough, reluctantly agrees to escort a mismatched group of American tourists to London, she has no idea she is about to embark on the adventure of a lifetime. After a hilarious misunderstanding at Heathrow Airport finds Madeline rescuing her group from airport security, they all emerge from the Customs Hall laughing and talking as if they had known each other for years. The tour goes wonderfully, with Madeline providing her incomparable spin on British history, until teenager, Kelly Dalton, never returns from an afternoon shopping expedition at the Burlington Arcade. Set in London and the English countryside, Madeline rallies her troops and uses their unique talents to uncover the mystery surrounding Kelly's abduciton. From Texas cowboy, Jake Donovan to the elderly Talbot sisters and her best friend, Chloe Ambrose, join Madeline as she uses her resourcefulness to lead her little army of sleuths into battle.