Holby City has seen Dylan Keogh face medical disasters, emotional crises and ethical dilemmas — but nothing has shaken him quite like the possibility that Matty could be his son. And this week, that theory pushes Dylan into territory even he knows is dangerous.

After refusing Stevie Nash’s blunt but reasonable advice to call his old friend and get answers the straightforward way, Dylan instead spirals into a quiet but frantic mission to uncover the truth on his own terms.

The result? A secret investigation that could blow up spectacularly in his face.

Blood types, panic, and denial

The first warning sign arrives when Dylan starts asking after Matty’s blood type — a clinical question that is anything but casual. To colleagues, it’s an odd detail. To viewers, it’s a clear sign that Dylan is trying to collect biological evidence without admitting to anything emotionally.

It’s a very Dylan move: intellectualise the problem, avoid the feeling.

But blood types only get him so far. They can rule out possibilities, but they can’t confirm them. So when the numbers don’t give Dylan the clarity he’s craving, panic begins to set in.

Suddenly, he needs a Plan B — something more direct, more conclusive… and far more risky.

A plan that goes too far?

This is where Dylan’s storyline becomes electrifying. Instead of backing down, he decides to take a different approach. But what exactly is he planning?

Several possibilities emerge:

1. Testing Matty without consent
Dylan could attempt to collect DNA through indirect means — discarded items, medical samples, or something Matty leaves behind. It’s unethical, borderline illegal, and completely out of character for Dylan… which is exactly why it’s so compelling.

2. Investigating the past quietly
He may dig into old records, track timelines, or reach out to someone who knew Ngozi and Matty during their early years. This would keep him hidden — but not necessarily safe.

3. Checking medical files
It wouldn’t be the first time a doctor bent patient confidentiality rules when emotions got involved. But if Dylan goes down that route, the fallout could be catastrophic.

Whichever plan he chooses, one thing is clear: Casualty is positioning him on a slippery slope.

Why he’s hiding it

Dylan’s refusal to talk to the friend from his medical school days isn’t just stubbornness — it’s fear. Fear of being wrong. Fear of being right. Fear of discovering a relationship he missed entirely.

The tragedy of the storyline is that Dylan isn’t trying to protect Matty — he’s trying to protect himself.

Will he get caught?

That’s the million-pound question.

Matty is sharp. Observant. Suspicious by default. If Dylan starts acting strangely around him — watching, testing, probing — Matty could easily put the pieces together.

And if that happens, the emotional explosion could rival any trauma case Holby has ever seen.

Because if Dylan is wrong, he risks humiliating himself and destroying trust.

But if Dylan is right?
He’s about to discover he’s a father through the most disastrous route possible.