Bloodfever is book two in the Fever series written by Karen Marie Moning – I strongly suggest you start reading this series with DarkFever, book 1 in this series as it starts where it has been left off in book 1.
In her fight to stay alive, Mac must find the Sinsar Dubh—a million year old book of deadly black magic, which holds the key to power over both the worlds of Fae and Man. Pursued by assassins, surrounded by people she knows she can’t trust, Mac finds herself torn between two dangerous and powerful men, V’lane, a lethal Fae prince and the mysterious Jericho Barrons.
For millennia the shadowy realm of the Fae court has coexisted with that of humans. Now the walls between the two are coming down and Mac is the only thing that stands between them.