The team reopens the 2003 double-murder of Steve and Lisa Harris, the parents of autistic Brent and custody-seeking big sister Lisa, whose boyfriend Greg Wells brings information suggesting that the boy might have witnessed the murder. The team looks into Brent having been bullied and discriminated due to his condition, despite Greg's fierce protection and help with his obsessively beloved fish Sammy. The parents' efforts to accommodate Brent's special school needs may have led to their deaths, having failed to cash in an the insurance fraud torching of their shop. Scotty works out the boy's photographic memory can provide invaluable clues, but only when properly asked, notably when he can respond with numbers, leading to uncover a Greek tragedy.
—KGF Vissers