It's Bob Allen's twenty-first birthday. His mother and his brother Jack, a policeman present him with a cap, personalized with his initals in the lining. Jack then goes to work and Bob goes out also. Later in the evening, Jack is called to the scene of a robbery, where he finds the cap with his brother's initials. Dismayed by the idea that his brother is a thief, he goes home and confronts Bob with the evidence. Though it breaks their mother's heart, Jack does his duty and leads his brother out in handcuffs.
| Release Date | May 31, 1909 | |
|---|---|---|
| Status | Released | |
| Original Title | His Duty | |
| Runtime | 7min | |
| Budget | — | |
| Revenue | — | |
| Language | No Language | |
| Original Language | English | |
| Production Countries | United States of America | |
| Production Companies | Biograph Company | |