Reveal and come clean are semantically related. in confess topic. In some cases you can use "Reveal" instead a verb phrase "Come clean", when it comes to topics like tell the truth.
Reveal verb – To make known (as information previously kept secret). Come clean and reveal are semantically related. You can use "Come clean" instead a verb "Reveal". Nearby Words: revealed, revealing
Though, Penguin can reveal in Episode 3 that it was actually due to Martha finding out about her husband's corruption and planning to come clean about it, prompting him to have her killed.