Dr Alfonso studied his old friend gravely, deeply concerned by all he was learning. Freeing Santiago from Eva's toxic influence would require monumental willpower and perseverance on his patient's part - and he harboured doubts over whether Santiago could sustain it after so many years submitting to her control.

"Come here daily so we can work through this gradually together," he urged. "The vital first step is you seeking help. But Eva can never discover anything, or I fear for my family's safety Santiago."

His friend nodded anxiously. "Of course - we'll be discreet. Can we use my office?"

"That's fine. I'll visit frequently under the guise of seeing my...