Darkness Falls Series by Jessica Sorensen

When the disease spread through the world, people had no choice but to go into hiding. The Colony is hidden deep underground, far away from the vampires—humans that were transformed by the disease. The vampires are hideous, starving, and they will kill any human they come across. Seventeen-year-old Kayla is a Bellator, a warrior that protects The Colony. In order to survive, there are three rules she must follow: Rule #1—Never go out after dark. Rule #2—Always carry a weapon... moreWhen the disease spread through the world, people had no choice but to go into hiding. The Colony is hidden deep underground, far away from the vampires—humans that were transformed by the disease. The vampires are hideous, starving, and they will kill any human they come across. Seventeen-year-old Kayla is a Bellator, a warrior that protects The Colony. In order to survive, there are three rules she must follow: Rule #1—Never go out after dark. Rule #2—Always carry a weapon. Rule #3—No matter what, never EVER get bitten. But what happens when the rules Kayla has always lived by can no longer apply? The Highers run The Colony and accept nothing less than perfection. One slip up can mean death. Kayla has always worked hard to follow the rules and strive for perfection. But during a moment of weakness, she lets her imperfections show. Her punishment is worse than death. She is chosen for The Gathering and is thrown out into a world full of starving vampires. No one has ever survived The Gathering, at least that’s what Kayla’s been told. But when she runs into a group who insist they were once part of The Gathering, Kayla discovers the Highers have been keeping secrets. Secrets that could lead to a cure. less

Kayla made her choice and now she has to live with it. She stays with the Day Takers, hiding in the city, staking vampires. But fighting vampires as a human is difficult. Sylas constantly pressures Kayla to choose the life of a Day Taker. But until Kayla knows what Monarch is planning, she can’t make her choice. Plus there’s Aiden. No matter how hard she tries, she can’t stop thinking about him. As Kayla’s memories resurface, the pieces of her history unfold... moreKayla made her choice and now she has to live with it. She stays with the Day Takers, hiding in the city, staking vampires. But fighting vampires as a human is difficult. Sylas constantly pressures Kayla to choose the life of a Day Taker. But until Kayla knows what Monarch is planning, she can’t make her choice. Plus there’s Aiden. No matter how hard she tries, she can’t stop thinking about him. As Kayla’s memories resurface, the pieces of her history unfold. She learns of Cell 7, a place that Kayla believes holds the answers to the creation of the virus. But getting to Cell 7 is a dangerous mission. And with Kayla's strength weakening, it's one mission she might not make it through alive. less

Kayla knows she has to save the world from the vampire virus, but what she didn’t realize was just how complicated it could be. As the secrets to the cure start to unfold, Kayla realizes that not only will her strength be tested, but her willpower as well. Tough choices will have to be made. In the end, she must decide just how much she’s willing to sacrifice to get to a cure.