Nancy encounters a mysterious saleswoman in a perfume shop, a curious man on the train, and then finds herself trying to decipher a strange code.

A strange fragrance -- Mysterious numbers -- Work on a code --A switch in jobs -- Money, money! -- A worrisom journey -- Nature cult -- Hillside ghosts -- Black snake colony member -- Plan of attack -- A midnight message -- Secret service agents -- A hesitant hitchhiker --Disturbing gossip -- Masqueraders -- Startling commands -- Tense moments -- Prisoners -- Destroyed evidence -- A final hunch.