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. overall | No. in series | Title | Director | Writer | Original air date | Production code |
| --- | --- | --- | --- | --- | --- | --- |
| 19.0 | 1.0 | "Episode 1" | Brian Kelly | Ed Roe | 6August2003 | 301.0 |
| 20.0 | 2.0 | "Episode 2" | Brian Kelly | Richard Stoneman | 13August2003 | 302.0 |
| 21.0 | 3.0 | "Episode 3" | Brian Kelly | Andrew Rattenburry | 20August2003 | 303.0 |
| 22.0 | 4.0 | "Episode 4" | Otto Bathurst | Richard Stoneman | 27August2003 | 304.0 |
| 23.0 | 5.0 | "Episode 5" | Otto Bathurst | Charlie Martin | 3September2003 | 305.0 |
| 24.0 | 6.0 | "Episode 6" | Otto Bathurst | Richard Stoneman | 10September2003 | 306.0 |
| 25.0 | 7.0 | "Episode 7" | Jonathan Fox Bassett | Ed Roe | 17September2003 | 307.0 |
| 26.0 | 8.0 | "Episode 8" | Jonathan Fox Bassett | Tony Basgallop | 23September2003 | 308.0 |
| 27.0 | 9.0 | "Episode 9" | Jonathan Fox Bassett | Ed Roe | 30September2003 | 309.0 |
| 28.0 | 10.0 | "Episode 10" | Susanna White | Andrew Rattenbury | 7October2003 | 310.0 |
| 29.0 | 11.0 | "Episode 11" | Susanna White | Jack Lothian | 13October2003 | 311.0 |
| 30.0 | 12.0 | "Episode 12" | Andrew Lincoln | Richard Stoneman | 20October2003 | 312.0 |
Question:
Who wrote "episode 4"?
Answer:
Richard Stoneman