After their friend who has been missing for more than three years turns up dead, four former best friends continue to receive frightening messages from someone who knows damaging secrets about them.

"Emily's been shipped off to Iowa to live with her überconservative cousins. Aria's boyfriend is behind bars--because of her. Spencer's afraid she was involved in Ali's murder. But Hanna's fate is far worse: she's clinging to life in the hospital because she knew too much. If these girls don't start listening to me, Hanna's going to look like the lucky one"--P. [4] of cover.

Seventeen-year-old Emma Paxton steps into the life of her long-lost twin Sutton to solve her murder, while Sutton looks on from her afterlife.

Former best friends Emily, Aria, Hanna, and Spencer continue to live in fear as they struggle to keep hidden even more secrets and someone new begins stalking them via their cell phones.

Aria's love life is on the Fitz--ahem, fritz. Emily's exploring her wild side. Hanna's kissing the enemy. And someone from Spencer's past--someone she never thought she'd see again--is back to haunt her. But none of that compares to what these pretty little liars did on their last spring break. It's their darkest secret yet. And guess who else knows?

Now that troubled Thayer Vega is back in town, Emma Paxton must struggle to figure out the relationship her twin has with him...and whether he may have been the one to kill her.

Ava, Caitlin, Mackenzie, Julie, and Parker are all driven to be perfect--no matter the cost. At first the girls think they have nothing in common, until they discover that they all hate the same person: handsome womanizer Nolan Hotchkiss, who's done things to hurt each of them. They come up with the perfect plan to murder Nolan--jokingly, of course. They'd never actually go through with it. But when Nolan turns up dead in the exact way they'd discussed,...

Sutton is watching from beyond the grave while her identical twin, Emma, assures her identity. Emma is repairing Sutton's relationship with her adoptive family when their birth mother shows up in Tucson. Emma hasn't seen Becky in twelve years, but Becky recognizes Emma immediately--as Emma. Is it a mother's intuition or does Becky know Sutton's already gone.

"My friends and I used to play lying games. Now my twin sister is living one. When I was alive, my family seemed picture-perfect. My adoptive parents adored me, and my little sister, Laurel, copied my every move. But now that my long-lost twin, Emma, has taken my place to solve my murder, we're both learning just how flawed my family really is. Laurel is shooting Emma nasty looks and sneaking around with my ex-boyfriend. And it turns out my parents...

After surviving their latest encounter with A, high school seniors Aria, Emily, Spencer, and Hanna must try to convince the police that the real A is still on the loose, all while trying to stay alive.