Red royal blood

Ruby has never encountered a riddle she couldn't solve. Although destined to spend the rest of her life as a servant to the royal family, her mind yearns for a true challenge. But no riddle could have prepared her for the king's decision, just before his death, to name her as his successor to the throne!
Suddenly thrown into the snake pit, she is forced to manage a kingdom in crisis, the dead king's enraged wife, and the three arrogant and irritatingly handsome princes. And then, as if it weren't enough that she has just been crowned queen, she discovers a note left for her by the king, in which he claims he was murdered.
Since she no longer knows whom she can trust, Ruby forms uneasy alliances with each of the princes. And as time runs out, she will face the most difficult challenge of her life: to discover the truth before the killer targets her as well.