Where does the speaker of the house fall in the order succession of the presidency?

According to U.S. Code, the Speaker of the House is first in line after the Vice-President to act as President when neither the President nor the Vice President is available, willing, able and qualified to do so.

If there is no House Speaker, or if the House Speaker is not able and qualified, the Presidency goes to the holder of the office highest on the following list who is able and qualified:

1. the President pro-tempore of the Senate
2. the Secretary of State
3. the Secretary of the Treasury
4. the Secretary of Defense
5. the Attorney General
6. the Secretary of the Interior
7. the Secretary of Agriculture
8. the Secretary of Commerce
9. the Secretary of Labor
10. the Secretary of Health and Human Services
11. the Secretary of Housing and Urban Development
12. the Secretary of Transportation
13. the Secretary of Energy
14. the Secretary of Education
15. the Secretary of Veterans Affairs