The Man in the Iron Mask: level 5

The former Musketeers return for yet another adventure. D'Artagnan, as captain of the Musketeers, will remain loyal to his king, however arrogant he is; Aramis and Portos, on the other hand, will try to free a mysterious prisoner from the Bastille, against the king's wishes. Who is the mysterious prisoner? Why will he have to wear an iron mask? Readers will be delighted to find out how justice and friendship finally prevail over injustice and corruption.