What is the book bloody valentine about by melissa de la cruz?

"Bloody Valentine" is a young adult paranormal romance novel by Melissa de la Cruz, part of her "Blue Bloods" series. It's the second book in the series and continues the story of Schuyler Van Alen, a human girl who discovers she's fallen in love with a vampire, and is now embroiled in the world of the Blue Bloods, an elite society of vampires.

Here's a brief summary of the plot:

* The Blue Bloods are under attack. A rogue vampire, the Red King, is determined to destroy the Blue Bloods and take over their world.

* Schuyler is caught in the middle. She's now a target, and is torn between her human life and her growing love for the Blue Bloods, especially the mysterious and charming Jack.

* The stakes are higher. As the Red King's plan unfolds, Schuyler and the Blue Bloods must find a way to stop him before he unleashes chaos.

* There's a shocking twist. The book reveals a shocking secret about Schuyler's past that throws everything she knows about herself and the Blue Bloods into question.

"Bloody Valentine" is a fast-paced and thrilling read with a blend of romance, action, and supernatural elements. It explores themes of love, betrayal, and the choices we make when our world is turned upside down.