Watch Silk Online. Fresh from a successful defence in a murder trial, barrister Martha Costello is immediately thrown two last-minute cases by the chambers’ senior clerk, Billy. The cases are being heard the following morning and Martha stays up all night preparing.Next morning she is joined by Nick, her new pupil , to whom she’s showing the ropes. They hurry off to meet the defendants: Rush and Mercedes. Rush is a quietly menacing man who questions whether Martha is up to the job, while Mercedes is pregnant and evidently the victim of a cruel drug-running ring. Martha hasn’t had a chance to prepare thoroughly and the judge passes a heavy sentence on Mercedes.