Red Money by Fergus Hume

It was lucky that Lambert did not know of the ordeal to which Agnes had to submit, unaided, since he was having a most unhappy time himself. In a sketching expedition he had caught a chill, which had developed once more a malarial fever, contracted in the Congo marshes some years previously. Whenever his constitution weakened, this ague fit would reappear, and for days, sometimes weeks, he would shiver with cold, and alternately burn with fever. As the autumn mists were hanging round the leafless Abbot's Wood, it was injudicious of him to sit in the open, however warmly clothed, seeing that he was predisposed to disease. But his desire for the society of the woman he loved, and the hopelessness of the outlook, rendered him reckless, and he was more often out of doors than in.

The result was that when Agnes came down to relate the interview with Silver, she found him in his sitting-room swathed in blankets, and reclining in an arm-chair placed as closely to a large wood fire as was possible. He was very ill indeed, poor man, and she uttered an exclamation when she saw his wan cheeks and hollow eyes. Lambert was now as weak as he had been strong, and with the mothering instinct of a woman, she rushed forward to kneel beside his chair.