Iain Dean (Michael Stevenson) is a man with many strings to his bow in Casualty.

After spending years working as a paramedic, he is now training as a member of the Hart team. Alongside this, Iain is putting his detective skills to the test, seemingly convinced he can work out who is responsible for the drugs theft and tampering going on in the hospital.

His focus at the moment is on his best mate but in this week’s episode, a new discovery means Iain is looking in the wrong place.

Will he work out the truth?

Elsewhere, Ngozi Okoye (Adesuwa Oni) learns some news from her son, forcing her to potentially make a life-changing decision.

Also, Flynn Byron (Olly Rix) has a lot on his mind during his latest shift. He later heads out all alone, as we learn he is hiding a secret from his colleagues in the ED.

We’re now over halfway into the latest boxset Supply and Demand. With some storyline arcs reaching huge turning points, others are only just beginning.

Here’s everything you need to know about this week’s episode of Casualty.

Flynn isn’t his usual self at work and seems unusually concerned about leaving his shift on time. Stevie Nash (Elinor Lawless) wonders if Flynn has a date but when he snaps at her, she realises there’s something going on with him.

Later, Flynn races to a graveside and places some flowers down. It’s someone’s anniversary, but who is he mourning?

Ngozi contemplates leaving

Ngozi overhears Nicole’s (Sammy T Dobson) phone call and worries she’s moving away. Ngozi is frosty with Nicole after this, but when she spots that a baby needs cataracts, Nicole compliments Ngozi on her good work. After learning that Nicole has no intention of moving away, Ngozi finds son Obi outside.

He reveals that he’s deeply unhappy in England, and wants to go back to Nigeria.

But will Ngozi leave?

Iain learns the truth about Jacob – but he’s too late

Acting on his suspicions, Iain confronts Jacob (Charles Venn) about the missing morphine. He takes offence that Iain would accuse him of stooping so low, and a fight breaks out between the friends.

Teddy (Milo Clarke) and Jacob are then called to a shout at a leisure centre, where a swimmer is experiencing breathing problems. Teddy notices a chlorine leak, leading to the evacuation of the pool, and the arrival of Iain and the rest of the HART team.

Things are tense, but Jacob and Iain need to form a temporary truce and work together. Iain heads into the building to rescue a lifeguard, but he realises a child is stuck inside as well. He risks his life to save her, knowing his oxygen tank is running low. After a scary situation involving Iain, he realises that Jacob isn’t the morphine thief.

He also reveals to Iain that he’s been working a side job as a takeaway driver to afford Blake’s private prescription. Unfortunately though, as they get back to the ED, they realise that Faith (Kirsty Mitchell) has reported Jacob for stealing the morphine.