While a mother watches her boyfriend scuba diving, her little boy falls into the water. The child is airlifted back to Holby, his mother wonders whether her desire for a relationship has endangered her son.
Liz and Penny, in the ambulance, are called out to a baby who turns out to be abby Louis who is being looked after by his nanny, Margaret. Back in A&E, Baz is traumatised when she has to take a blood sample from her own baby. But it is only a febrile convulsion due to overheating.
A suspected meninigitis case turns out to be food poisening. A man and a woman are brought in. He has hit her over the head in an attempt to stop her fellating him while in the middle of a seizure.