A crime has been committed and there are five suspects. Precisely one of the suspects is a knight and the remaining four are liars.
- Arthur said Dave did it, Dave said Bill did it, Bill said Cal did it.
- Cal said that he didn't do it and Eddie confessed that he did it.
- It is known that Arthur did not do it.
If precisely one of the suspects did it, who committed the crime?
, the only knight among the liars was also a criminal.