The SARS outbreak and isolation on Combe Island transform an already difficult murder investigation into a medical emergency. When Dr. Speidel is diagnosed with SARS after being transferred to Plymouth, the island’s residents agree to remain under quarantine; Commander Dalgliesh then falls ill, and Inspector Kate Miskin and Sergeant Benton-Smith must continue investigating while their senior officer is confined to a sickroom. The outbreak makes the island both a home that its residents cannot leave and a closed investigative field in which illness, uncertainty, and urgent police work converge.

From emergency transfer to confirmed diagnosis

Dr. Speidel’s worsening condition first brings the outbreak into view as a problem of medical capacity. His temperature rises alarmingly overnight, and Rupert Maycroft tells Dalgliesh that Dr. Guy Staveley is arranging his transfer to a hospital in Plymouth because Combe Island has no facilities to nurse someone seriously ill. A helicopter is expected, and soon after landing it carries Speidel away. For the police, the evacuation removes a suspect from their immediate reach; for the island, it is the beginning of a wider emergency.

The diagnosis is confirmed after Speidel reaches hospital. Staveley tells Dalgliesh that the island will probably need to be quarantined and that he is consulting the authorities. Dalgliesh and Jo Staveley are identified as especially vulnerable because Dalgliesh helped Speidel after he collapsed and accompanied him back to his cottage, while Jo nursed him. Staveley describes the initial symptoms as resembling flu: high temperature, aching limbs, and loss of energy, with a cough that may develop later. He does not mention his own exposure during the conversation, although his role in managing the response places him close to the outbreak’s risks.

Quarantine and the transfer of responsibility

At a meeting of the island’s residents, Kate Miskin explains that the gathering has two immediate causes: Adrian Boyde’s body has been found in the chapel, and Speidel has SARS. Dalgliesh is also ill, so Kate announces that she will lead the investigation with Sergeant Benton-Smith. Their work will continue on both Nathan Oliver’s death and Boyde’s murder, even as the outbreak changes the conditions under which they can investigate.

Staveley gives the residents a practical account of the danger. SARS spreads primarily through close person-to-person contact, possibly through droplets from coughing or sneezing, or through touching a contaminated surface and then transferring infected material to the nose, mouth, or eyes. He acknowledges that other airborne transmission may be possible but is not established. Those who had close contact with Speidel or Dalgliesh are at particular risk, yet he recommends that everyone on Combe Island accept voluntary quarantine for about ten days. The Public Health Authority has powers to impose quarantine on infected people and, in some circumstances, those at risk; Staveley argues that a voluntary island-wide restriction is the most sensible course while they await advice that it is safe to leave.

The request is also framed through the islanders’ sense of home. Staveley points out that residents are not being quarantined away from home but asked to forgo trips to the mainland until the danger has passed. No one objects at first, though Millie briefly looks rebellious before accepting the restriction. Daniel Padgett protests that he has an interview in London for a university course and has decided to leave Combe after his mother’s death. Missing the interview, he fears, could cost him his chance of a place. His objection exposes the personal cost of the collective measure: isolation may be medically prudent, but it interrupts individual plans at a moment of grief and change.

Illness, care, and medical responsibility

The outbreak also places Staveley’s professional authority in a new light. At the residents’ meeting he speaks calmly and authoritatively, explaining both transmission and the reason for quarantine; later, Dalgliesh’s condition makes the physician’s guidance immediate rather than general. Dalgliesh’s last confused memories of Tuesday morning include being supported into a buggy and taken across the scrubland, then helped into bed by a masked, white-coated figure. He remembers insisting that he must stay on Combe Island, partly because he fears Emma will not know where he has gone and partly because an unfinished job at the lighthouse still holds him there.

By Wednesday evening Dalgliesh is clearer in mind but weaker in body. Coughing repeatedly wrenches his chest and makes breathing difficult. As the attacks worsen, Staveley and Jo Staveley attend him, insert tubes into his nostrils, and provide oxygen. Jo remains beside him in the sickroom, sometimes resting in a chair while he wakes and sleeps. The disease reduces the investigator who has been directing the case to dependence on his colleagues and carers; his authority now consists partly in communicating what must be done before his strength or speech fails.

Staveley’s conduct takes place against an older burden of medical responsibility. Jo tells him that the practice in London wants him back and that former patients are asking for him. In the same conversation, Staveley acknowledges that Winston Collins died of peritonitis after he failed to answer the boy’s mother’s call. He refuses to use the racial accusations surrounding that death as an excuse for his own decision, saying that he should have gone and that one should never take chances with a child. This history does not explain the outbreak, but it gives context to the seriousness with which he assumes a doctor’s obligations during it, as Combe Island’s limited medical facilities force him to make consequential decisions about transfer, exposure, and care.

The investigation inside the quarantine

Quarantine does not suspend the murder inquiry; it makes continued investigation more urgent and more precarious. Dalgliesh becomes convinced that Kate and Benton must find a phial of blood and a lock of Martha Padgett’s hair. He knows that motive and opportunity alone do not establish the case: Padgett had reason to hate Oliver, but so did others, and more than one person could have reached the lighthouse unseen. Without the blood and hair, Dalgliesh fears, the case may never reach court.

His concern is sharpened by the possibility that Oliver’s death could be disputed in court. Mrs. Burbridge believes Oliver may have died accidentally during an experiment, a theory consistent with the possibility that he might have undertaken such an experiment. Edith Glenister’s post-mortem findings establish that Oliver died from asphyxiation caused by manual strangulation and that the injury to his throat could not have been self-inflicted, but Dalgliesh recognizes that the interpretation of bruising after death could be challenged by defence pathologists. Glenister has also reported that someone attempted to wipe the rope clean along its length. The combination of a disputed alternative explanation, potentially contestable forensic evidence, and missing physical evidence leaves the inquiry vulnerable even before illness sidelines its lead investigator.

Dalgliesh’s appeal to see Kate comes from the fear that his cough will return, that he may deteriorate or lose the ability to speak, and that the evidence may remain undiscovered if he cannot convey what he has understood. The outbreak therefore intersects with the case at its most fragile point: the police are confined to the island, their commander is seriously ill, and the distinction between a persuasive theory and a provable murder depends on evidence still to be found. Quarantine protects the wider community while turning time, communication, and the continuity of the investigation into urgent practical concerns.