Mockingjay, the third book in the Hunger Games series, will come out on August 24th.
The third book in the Missing series, Sabotaged, comes out on August 24th.
Clockwork Angel, the first book in the Infernal Devices series, is coming out on August 31st.
The tenth and last 39 Clues book, Into the Gauntlet, comes out on August 31st.
Vampire Academy by Richelle Mead
"Only a true friend can protect you from your immortal enemies...
Lissa Dragomir is a Moroi princess: a mortal vampire with an unbreakable bond to the Earth's magic. She must be protected at all times from Strigoli; the fiercest and most dangerous vampires-the ones that never die.
The powerful blend of human and vampire blood that flows through Rose Hathaway, Lissa's best friend, makes her a Dhampir. Rose is dedicated to a dangerous life of protecting Lissa from the Strigoli, who are hell-bent on making her one of them.
After two years of illicit freedom, Rose and Lissa are caught and dragged back to St. Vladmir's Academy, hidden in the deep forests of Montana. Rose will continue her Dhampir education. Lissa will go back to being Queen of the elite Moroi social scene. And both girls will resume breaking Academy hearts.
Fear made Lissa and Rose run away from St. Vladmir's-inside the Academy's iron gates, their world is even fraught with danger. Here, the cutthroat ranks of the Moroi perform unspeakable rituals, and their secretive nature and love of the night creates an enigmatic world full of social complexities. Rose and Lissa must navigate through this dangerous world, confront the temptation of forbidden romance, and never once let their guard down, lest the Strigoli make Lissa one of them."