Illusionarium (Unabridged‪)‬

In a steampunk world full of airships and adventure, 16-year-old Jonathan lives a quiet life on a far north aerial city. But when his mother and sister fall ill with a mysterious and fatal disease, Jonathan must travel through an alternate London full of illusions and monsters to get the cure. But can he find it before his family dies...and before he turns into a monster himself?