This article covers a real-world subject which should not be taken as part of the Holby universe.
"Hidden" is the 853rd episode of Casualty and the 30th episode of the 27th series.
Synopsis[]
Two schoolgirls are brought in after being injured during a science exam, but when tensions rise between the pair, Zoe has to act as peacemaker to reconcile them. Tom helps a young boy suffering from stomach pains, and while he is reluctant to be treated, his mother only makes things worse.