A terrible crime has been committed and the police round up the usual suspects. During the interrogation of the four men the following accusations and statements are made:
Anderson said "Brimmers did it."
Brimmers said "Dodge did it."
Carter said "I didn't do it."
Dodge said "Brimmers lied when he said I did it."
If only one of the four men was untruthful, which man committed the crime?
A and B say contradictory things, so one must be a liar. Also, B and D say opposite things, so one must be a liar. Since there's only one liar, it must be B; A is thus a Knight, and B is guilty.