The girl's fainting
spell
was obviously a
decoy to
lure
the guard from the library.
She could not have been the niece of the
deceased man, who had been a bachelor and
an only child.
spell:
trance (conjuro, hechizo)
decoy:
something used to tempt victims into danger (señuelo, carnada)
to lure:
to attract, tempt or provoke (atraer la atención, despistar)
deceased:
dead, no longer alive (muerto)