S3·E3 Heavy Metal

Costello is engaged by euthanasia campaigner and solicitor Aisha Wiseman to defend Sarah Stephens, accused of helping her tetraplegic daughter to die. Reader is prosecuting and brings in Sarah's ex-husband and their teensge son as witnesses. Whilst two expert witnesses appear to endorse this and Sarah's defensive attitude towards her family make her less than cooperative, Costello realises that she may be covering for somebody else.