Overview:Part one of two. Guy's plans for his much anticipated Neurosurgical Unit are put in jeopardy when he makes a shocking discovery about Tristan Wood - the Unit's main benefactor. Meanwhile, Serena considers re-kindling her romance with a smitten Robbie but, with Bernie in her thoughts, can she commit to happy ever after with him? And Ric is pressurised to undermine everything he's worked for by Tristan.