The Wyvern, the Pirate, and the Madman

Book 4

After the destruction of the main pirate ship, Celwyn discovers that another niece of the vampire Valentine Soriano has been taken prisoner by the pirates.  Captain Nemo, Bartholomew and the rest of the adventurers follow the ship with the remaining pirates as it heads to the far East. Hurriedly telegrams to Prague tell Mrs. Kang and the others that they do not know when they’ll be back, and little more. The Nautilus catches up to the pirate ship and retrieves the kidnapped vampire, and also discover nearly 500 slaves imprisoned in the hold.  They eventually trick the pirates into delivering the slaves to safety and continue eastward.  The captain of the pirates has something of Nemo he must retrieve.  The adventurers find a most complex problem awaiting them in the Sulu Islands, not knowing of a horrible murder in Prague of someone most dear to them.