Terry pulls out the other thing he rescued from the Celeste: a book entitled Medicine for the Deep Sea Sailor. He hands it to you.

"Okay," he says. "The symptoms we've seen are these, right?"

"Brendan: sudden onset of fever and chills. Sick for about five days, then he seems to have recovered completely.

"Kerry: sudden onset of fever, chills and muscle ache. Sick for about four days now.

"Alistair: slow onset of malaise, fever, and now a productive cough.

"Tomas: sudden onset of shock, with mental confusion.

"All the patients were confined to bed and given plenty of food and fluids."