Prism for the Windows Runtime for Windows 8.1 available as an e-book

Prism for the Windows Runtime accelerates the development of Windows Store apps by providing support for Model-View-ViewModel (MVVM), loosely coupled communication, state management, navigation, validation of user input, data binding, commands, and settings.

Prism for the Windows Runtime for Windows 8.1 is now available as a free e-book and can be downloaded from here.