Sunni and Blaise are dragged once more to Blackhope Tower when a mysterious oil lantern appears. This lantern however, contains painted slides that conceal the secrets of Fausto Corvo's lost paintings. After journeying inside, they discover Corvo's old enemy, Soranzo, who is still seeking both the paintings and passage into the Marineer's Return to Arcadia. Soranzo, however, will stop at nothing to find Corvo. He even proceeds to kidnap Blaise and Sunni's art teacher after going into one of the painted slides.
The Shadow Lantern is the third book of the series Blackhope Enigma. When mysterious painted slides appear at Blackhope Tower, both Sunni and Blaise are required to return to where it all began. They later discover that the slides conceal secrets about Fausto Corvo, who is an artist-magician. Both Sunni and Blaise are now forced to fight against one of Corvo’s old enemy, Soranzo. Will they succeed in protecting Corvo’s secret or will Corvo’s secrets be found out?