12-05-2013 10:25 AM - edited 12-05-2013 10:27 AM
There are books on C++, books on Qt (QML) but there are no books on Cascades as far as I know.
As a beginner I would start here as the online documentation, read together with the tutorials and downloading and investigating the samples will teach you all you need to know...
12-06-2013 02:29 PM
A BlackBerry 10 development book - which includes Cascades - is being released very soon.