Ferber makes us root for dirk, only to reveal at the end that Roelf is the son that Selina wishes she had.
The Black Watch major in command presented him with an officer's dirk.
For the non-English majors among you, “dirk” is the Shakespearean term for dagger.
c.1600, perhaps from Dirk, the proper name, which was used in Scandinavian for "a picklock." But the earliest spellings were dork, durk (Johnson, 1755, seems to be responsible for the modern spelling), and the earliest association is with Highlanders, however there seems to be no such word in Gaelic, where the proper name is biodag. Another candidate is German dolch "dagger."