View source for The Final Hours of Portal 2

The Final Hour of Portal 2 takes you deep within the top-secret offices of Valve, creators of Half-Life, for an unvarnished look at the creative process behind the new video game Portal 2. Journalist Geoff Keighley was granted unprecedented “fly on the wall” access to Valve over the past three years to create this story. From the hush-hush Portal prequel that was shelved to the last minute scramble to complete the game’s story, The Final Hours of Portal 2 is a gripping and dramatic story. (goodreads.com)