1
general::
Carry off mysteriously or secretly, as in The police found that the documents had been spirited away from the office. This term derives from the noun spirit, in the sense of "a supernatural being such as a ghost." [Second half of 1600s]
American Heritage Idioms
2
general::
Phrase(s): spirit someone or something away (somewhere)
to sneak someone or something away to another place. • The police spirited the prisoner away before the crowd assembled in front of the jail. • They spirited away the celebrity.
McGrawhill's American Idioms And Phrasal Verbs