watched.

During the two following days, which the fugitives spent on the
island, nothing suspicious was discovered. Wherever the lieutenant
went he was closely followed by his keeper, and he was never allowed
to be alone with the other rebels. In fact, he did not seem at all
desirous of having any conversation with them, for, with the exception
of taking a short walk about the island after every meal, he passed
both day and night in dozing in the cabin. The rebels, on the other
hand, appeared to believe him a "Yankee," and as such, considered him
beneath their notice. Frank was beginning to think that his fears had
been utterly groundless, when, on the third night, he was fortunate
enough to detect a plot, which, if carried into execution, would have
put an end to all his hopes of seeing home again, perhaps forever.

It was his duty to stand sentry from dark until midnight. As he walked
his beat, listening for the signal of the negro, whom he every moment
expected with another supply of provisions, and thinking over the
scenes through which he had passed since he had entered the service,
he heard a slight rustling in the bushes back of the cabin, and saw
one of the deserters disappear among the trees. What could the man
mean by moving about the island at that time of night? There must be
something wrong, for his stealthy movements proved that he did not
wish to be observed. While Frank was pondering upon the subject,
and debating the propriety of informing the major of the fact, the
lieutenant sauntered leisurely up to the place where he was standing,
and, stretching his arms, languidly inquired:

"Don't you think it is very sultry this evening? It is impossible for
me to sleep."