Sheila has to take the decision whether or not to have a brain operation for her depression. She knows there are no guarantees it will work - but it might. More than 20 years ago she was eagerly expecting the birth of a child. The birth was normal but Sheila suffered a severe postnatal depression which eventually progressed to a seemingly incurable deep depression. After many years of enduring every form of treatment, none of which worked, Sheila was offered the last resort - surgery on her brain.