The unheralded arrival of a new client causes Kate to pause before agreeing to take on the case. The investigation surrounds the death of surgeon Rupert Decker-White at a New Year party at Fair Acres Private Hospital. His widow is convinced that he was murdered by deliberately being given a peanut to which he was known to be severely allergic.When Hubert reveals some surprising plans, Kate decides she needs time on her own and agrees to work undercover at the hospital.