Sara Wolf

Now a New York Times bestseller!
It's been three years, twenty-five weeks, and five days since Isis Blake fell in love, and if she has it her way, it'll stretch into infinity. Since then, she's punched Jack Hunter—her nemesis-turned-maybe-something-more—in the face, survived a brutal attack by her mom's abusive ex thanks to Jack's heroics, and then promptly forgotten all about him.
The one bright spot for Isis is

...

Seventeen-year-old Isis Blake hasn't fallen in love in three years, nine weeks, and five days, and after what happened last time, she intends to keep it that way. Since then she's lost eighty-five pounds, gotten four streaks of purple in her hair, and moved to Buttcrack-of-Nowhere, Ohio, to help her mom escape a bad relationship.
All the girls in her new school want one thing—Jack Hunter, the Ice Prince of East Summit High. Hot as an Armani...

Zera is a Heartless, the immortal, unaging soldier of a witch. Bound to the witch Nightsinger, Zera longs for freedom from the woods they hide in. With her heart in a jar under Nightsinger's control, she serves the witch unquestioningly. The witch asks Zera for a prince's heart in exchange for her own, with one addendum: if she's discovered infiltrating the court, Nightsinger will destroy Zera's heart rather than see her tortured by the witch-hating...

"Reunited with Lucien, Malachite, and Fione, Zera finally has the choice of whether or not to regain her humanity and give up her life as a Heartless. But with war raging and an army of valkerax on the loose, she's never needed immortality more. Will they be able to stop Varia without sacrificing themselves in the process?"--Goodreads.