how does colin find out about penelope

In Bridgerton , Colin finds out about Penelope when he discovers she is Lady Whistledown —the anonymous gossip columnist he has been publicly hunting down.

How Colin learns the truth

• After their engagement, Colin becomes increasingly obsessed with exposing Lady Whistledown, partly because he feels betrayed that the woman he loves is also the author who has been mocking the ton (and, indirectly, him).

• He follows Penelope after she abruptly leaves a ball and trails her to the printer’s shop, where he sees her handling the scandal sheets and realizes she is the one writing them.

• In that moment, he understands that the “sworn enemy” he has been trying to unmask is actually Penelope Featherington , the woman he just proposed to and loves.

After the reveal

• Colin feels hurt and betrayed by her secrecy, and he is also deeply shaken that his best‑friend‑turned‑wife has been hiding such a powerful double life.

• Despite the tension, they ultimately marry , though their relationship stays strained as Colin wrestles with jealousy, pride, and the fallout of her identity as Lady Whistledown.

If you tell me which version you mean (books vs. Netflix), I can break it down even more specifically for that canon.