IT’S had a speedy return to screens but we’re not complaining. Last week’s season- opener headed to o London for a visit with the brother of Holmes ( Jonny y Lee Miller). Tonight, we delve into Watson’s ( Lucy Liu, pictured) past as a tragic mistake hinted at last season ason comes back to haunt her. Joey Castoro ( guest star Jeremy Jordan from Smash), the son of the patient who died on Watson’s watch, pays her a visit. The question tion is: at what point do you leave your guilt behind and d give yourself permission to live?