When the schizophrenic Gary Kingston murders his social worker, his case is handed over to the unsuspecting Anna Spalinsky. Social Services know that when Gary doesn't take his medication his friend Michael can exert an undue influence over him. But who is Michael?
| Actor | Role |
|---|---|
 John SimmGary Kingston | Gary Kingston |
 Phyllis LoganAnna Spalinsky | Anna Spalinsky |
 Paul ReynoldsMichael | Michael |
 Matthew ScurfieldTrevor | Trevor |