Section 27. A crime described in section twenty-six may be tried in the county where committed or in any county in or to which the person so seized, inveigled or kidnapped is confined, held, carried or brought; and upon the trial of any such crime, the consent thereto of the person so seized, inveigled, kidnapped or confined shall not be a defence unless the jury finds that such consent was not obtained by fraud or extorted by duress or threats.