Holby City might be drowning in chaos, but Casualty fans know the most explosive storylines often begin in silence — and this week, that silence belongs to Dylan Keogh.

The normally composed ED medic is clearly distracted at work, struggling to focus as one horrifying possibility gnaws away at him: What if Matty is his biological son?

It’s a theory so wild, so life-altering, that Dylan can barely say it out loud — even to himself. But the panic in his eyes tells the audience everything long before he says a word.

Dylan loses his grip as reality closes in

While dealing with patients, charts, and the relentless demands of the ED, Dylan quietly unravels. He miscalculates timings. He loses track of simple details. He looks over at Matty just a fraction too long — and every time, the tension spikes.

This isn’t just a curiosity. It’s a bomb ticking in his chest.

When Stevie Nash corners him — always sharper than she gets credit for — Dylan finally admits the truth: he can’t stop thinking about the possibility that Matty might be his son.

Stevie reacts with her usual brutally pragmatic clarity. Phone your friend from medical school. Get the answers. For Stevie, knowledge is survival. For Dylan, knowledge is fear.

He dismisses her suggestion immediately — not because it’s a bad idea, but because it’s the one idea he’s too afraid to face.

A secret mission begins

What makes this storyline so compelling is Dylan’s instinctive retreat into secrecy. Rather than confronting the truth directly, he decides to quietly investigate it himself — slipping into a private mission he’s not remotely prepared to handle.

To the staff around him, he tries to look composed. He tries to act normal. But Casualty fans know Dylan too well: when he starts avoiding direct conversations, refusing eye contact, or suddenly disappearing into offices with “paperwork,” it means only one thing — he’s hiding something.

How far will Dylan go?

The massive question now looming over the ED is simple:
What exactly will Dylan do to find out the truth?