The Mysterious Pirandettis
E. Phillips Oppenheim
First published in The Strand Magazine Nov. 1934 and 4th of 4 stories in the series General Besserley Intervenes. 6th story in the collection .
The young brother and sister named Pirandetti may or may not be a Count and Countess as they claim. No one knew of them before they arrived in Monaco. Besserley was intrigued with them but even more so when they disappeared onto a ship pretending to be a yacht, all from an invitation by Besserley that he did not send.