Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. in\nseries | No. in\nseason | Title | Directed by | Written by | Original air date | Production\ncode | U.S. viewers\n(millions) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | 1 | "Pilot" | Jace Alexander | Matt Nix | June 28, 2007 | BN100 | 4.0 |
| 2 | 2 | "Identity" | Rod Hardy | Matt Nix | July 5, 2007 | BN101 | 4.0 |
| 3 | 3 | "Fight or Flight" | Colin Bucksey | Craig O'Neill & Jason Tracey | July 12, 2007 | BN103 | N/A |
| 4 | 4 | "Old Friends" | David Solomon | Alfredo Barrios, Jr. | July 19, 2007 | BN102 | N/A |
| 5 | 5 | "Family Business" | Sandy Bookstaver | Matt Nix | July 26, 2007 | BN104 | N/A |
| 6 | 6 | "Unpaid Debts" | Paul Holahan | Nick Thiel | August 2, 2007 | BN105 | 4.41 |
| 7 | 7 | "Broken Rules" | Tim Matheson | Mere Smith | August 9, 2007 | BN106 | N/A |
| 8 | 8 | "Wanted Man" | Ken Girotti | Craig O'Neill & Jason Tracey | August 16, 2007 | BN107 | N/A |
| 9 | 9 | "Hard Bargain" | John Kretchmer | Alfredo Barrios, Jr. | August 23, 2007 | BN108 | 4.08 |
| 10 | 10 | "False Flag" | Paul Shapiro | Matt Nix & Ben Watkins | September 13, 2007 | BN109 | 4.0 |
| 11 | 11 | "Dead Drop" | Jeremiah Chechik | Craig O'Neill & Jason Tracey | September 20, 2007 | BN110 | 4.8 |
| 12 | 12 | "Loose Ends" | Stephen Surjik | Matt Nix & Alfredo Barrios, Jr. | September 20, 2007 | BN111 | 4.8 |
Question:
what was the title of the only episode written by nick thiel?
Answer:
"Unpaid Debts"