In this episode we follow staff as they unravel the mystery of 54-year-old Richard, who arrives, suffering symptoms of a suspected stroke. Neurology registrar Vijay works quickly to assess what may have happened and Richard is sent to CT. But whilst undergoing his scan he has a further seizure, which gives Dr Vijay a strong indication that his symptoms may not have been caused by a stroke. Meanwhile, 76-year-old Peter arrives in A&E with a severe head injury, covered in blood, but it's not clear what exactly has happened to him. As Dr Fiona tries to get to the root cause, Peter is declared a code red emergency and doctors needs to give him an emergency blood transfusion.