"Divergent" debuts first full-length trailer

Get ready to dive in (or off a train, if you're Dauntless) with a new "Divergent" trailer.

The first full-length trailer for the film arrived online Wednesday, showcasing the futuristic world from Veronica Roth's bestselling novel.

"Divergent" is about Beatrice "Tris" Prior (Shailene Woodley), who lives in a futuristic society where people are divided into four different factions based on their values.

In the trailer, Tris takes a test that is supposed to indicate what faction she's best suited for. But, instead, she learns she's Divergent -- meaning she doesn't conform to any one category.

After being told this information must be kept secret, Tris decides to join the Dauntless -- the faction that values bravery above all else. Here, she meets her instructor, Four (Theo James), and sets out to uncover why being Divergent is dangerous.

Also starring Kate Winslet, Ashely Judd, Miles Teller, Tony Goldwyn, Zoe Kravitz and Jai Courtney, the Neil Burger-directed "Divergent" will open in theaters on March 21.

Tell us: What do you think of the trailer?