What to read after Crito?

Plato's Crito is an investigation of morality and justice. It presents a dialogue which takes place in Socrates' prison cell, where he awaits execution. He is visited by his friend Crito who has made arrangements to smuggle him out of prison. Socrates, however, reasons that this would be the wrong moral choice, and that he should act justly rather than selfishly. This edition of the Crito was first published in 1888, with a second edition published in 1891. It is now on its sixteenth printing. The text is given in full, in the original Greek with an introduction and notes.