Summaries taken from books.simonandschuster.com
NIGHT WORLD SERIES (Some of the couples listed below)
1) In Secret Vampire, Poppy thought the summer would last forever. Then she was diagnosed with terminal cancer. Now Poppy's only hope for survival is James, her friend and secret love. A vampire in the Night World, James can make Poppy immortal. But first they both must risk everything to go against the laws of Night World.
2) Fugitives from Night World, three vampire sisters leave their isolated home to live among humans in Daughters of Darkness. Their brother, Ash, is sent to bring the girls back, but he falls in love with their beautiful friend.
3) Armed with a wooden stake, martial arts, and the will to resist a vampire's mind control, Rashel struggles to avenge her mother's death in The Chosen. Then she meets Quinn, her soulmate, who is part of the world she has vowed to destroy.
4)In Black Dawn, Maggie stumbles upon an old Night World kingdom where the ruling vampire prince is both an enemy and an ally.
DARK VISIONS
Kaitlyn Fairchild has always felt like an outsider in her small hometown. Her haunting eyes and prophetic drawings have earned her a reputation as a witch. But Kait's not a witch: She's a psychic. Tired of being shunned, Kait accepts an invitation to attend the Zetes Institute, where she can have a fresh start and study with other psychic teens.
Learning to hone her abilities with four other gifted students, Kait discovers the intensity of her power -- and the joy of having true friends. But those friendships quickly become complicated when Kait finds herself torn between two irresistible guys. Rob is kind and athletic, and heals people with his good energy. Gabriel is aggressive and mysterious, a telepath concealing his true nature as a psychic vampire, feeding off of others' life energy. Together, Rob and Gabriel's opposing forces threaten the group's stability.
Then one of the experiments traps the five teens in a psychic link. A link that threatens their sanity and their lives. And Kaitlyn must decide whom to trust...and whom to love.