Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Who's the writer of the episode see by 12.13 million US viewers?

### Inputs:
table_name: table, columns: ['Series #', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (millions)']

### Response:
SELECT Written by FROM table WHERE U.S. viewers (millions) = 12.13