The summary is:
1. The dialogue between Euthyphro and Socrates explores whether something is just because the gods declare it so, or if it is just inherently because of its nature.
2. They meet while both awaiting separate trials at the courthouse. Euthyphro is prosecuting his own father, which Socrates questions him about.
3. Though familiar with Socrates' questioning method, Euthyphro does not like being questioned himself and becomes uncomfortable when Socrates inquires about his prosecution of his father.