If you’re a fan of George R. R. Martin’s “A Song of Ice and Fire” and/or its TV series adaptation, HBO‘s “Game of Thrones,” then you’ll definitely want to download George R. R. Martin’s A World of Ice and Fire.

Developed by Random House Digital, A World of Ice and Fire is the first and only official companion app of Martin’s bestselling series of epic fantasy novels.

A World of Ice and Fire is an exhaustive guide to the sprawling-to-the-point-of-confusing fictional world laid out by Martin in “A Song of Ice and Fire.”

The app offers more than 540 character profiles and more than 380 place profiles. Each character profile includes bios and book appearances, while each place profile includes castle descriptions and geographical specifications.

George R. R. Martin’s A World of Ice and Fire

The app also includes interactive maps and artistic depictions of key characters and places in the canon. In addition, it features a neat, customizable anti-spoiler functionality and new text from the webmasters of “A Song of Ice and Fire” fan site Westeros.org.

Designed for both iPhone and iPad, and already optimized for iPhone 5, George R. R. Martin’s A World of Ice and Fire is available now in the App Store for free.

The app gives you free access to the profiles of eight viewpoint characters and the interactive maps of the North and the South.

Should you want more content, you can buy the InfoPacks for the five books in the ongoing series: “A Game of Thrones,” “A Clash of Kings,” “A Storm of Swords,” “A Feast for Crows,” and “A Dance with Dragons.” You can purchase the InfoPacks in-app individually or collectively at a discount.