Marvel Avengers Extinction Key

"The official prequel to the blockbuster action video game Marvel's Avengers, written by bestselling author Greg Keyes. The novel leads into the game as an ancient organization called the Zodiac seeks to acquire an infinitely powerful weapon-the Zodiac Key. Captain America, Iron Man, Thor, Black Widow, and the Hulk must stop them before they use the key to warp the very fabric of timeand space."