Story Structure — 4 Plot Phases

A San Francisco waterfront café is established as the setting for the story. Its manager seeks money to secure his daughter's entry into society.

Waterfront Café Establishment — A waterfront café serves as the central setting for the wartime espionage activity. Location: San Francisco waterfront café
Financial Social Ambition — The café manager seeks enough money to secure his daughter's entry into society. Location: San Francisco waterfront café

The manager sells his services to foreign spies. His café becomes a rendezvous point for their covert meetings.

Espionage Services Sold — The manager sells his services to a gang of foreign spies for financial gain. Location: San Francisco waterfront café
Café Becomes Rendezvous — Foreign spies use the café as a meeting place for their covert operations. Location: San Francisco waterfront café

The spies hide a secret code in the lyrics of Lydia. The song is performed repeatedly without the singer knowing its true purpose.

Code Hidden In Lydia — The spies conceal their secret code within the lyrics of a song called Lydia. Location: San Francisco waterfront café
Repeated Song Performances — The manager's daughter performs Lydia on request day after day without knowing its coded purpose. Location: San Francisco waterfront café

The covert plan involves sending out a Japanese vessel. Its intended mission is to raid and destroy American merchant ships.

Covert Vessel Dispatch — The espionage plan aims to send out a Japanese vessel covertly. Location: Unspecified maritime setting
Merchant Ship Attack Plan — The vessel is intended to raid and destroy American merchant ships. Location: Unspecified maritime setting

Story Breakdown

Waterfront Café — The San Francisco café provides the main social and operational setting.
- Café Management — The establishment is managed by a figure seeking financial security.
- Rendezvous Site — Foreign spies use the café as a meeting place.
Social Ambition — The desire to finance a daughter's entry into society motivates the manager's choices.
- Financial Need — The manager wants to make enough money.
- Society Entrance — The intended goal is the daughter's entry into society.
Espionage Deal — The manager becomes involved with foreign spies by selling his services.
- Services Sold — Financial motivation leads to cooperation with the spy gang.
- Foreign Spies — The spies organize covert activity through the café.
Coded Song — The lyrics of Lydia conceal the spies' secret code.
- Secret Lyrics — The song contains the hidden communication code.
- Daily Requests — The song is performed repeatedly on request.
Unwitting Performance — The singer performs the coded song without understanding its espionage function.
- Unaware Singer — The performance is described as unwitting.
- Repeated Transmission — Day-after-day performances help circulate the hidden code.
Maritime Attack — The covert operation targets American merchant shipping through a Japanese vessel.
- Vessel Dispatch — The plan is to send out a Japanese vessel covertly.
- Merchant Ships — The intended targets are American merchant ships.