Selene is slowly dying...too bad that's the least of her problems.
You could say that Selene Vanream has a lot of problems. First there's the Rot that's slowly killing her, despite everything Ilyse and Micah are doing to find a way to save her.
Then there's Andrew, the ghost of her boss who is anchored to the living world. Selene would like to ignore him, but anchored ghosts with unsettled business turn into anchored beasties, so she can't write him off. The government has sent a team to post up at Affairs of the Dead and keep an eye on her, which includes making sure she plays up to Andrew to keep him from turning.
On top of that, someone is using Selene's new power to create anchored ghosts for their loved ones to keep around. Not good since the culprit doesn't have a clue about that whole anchored beastie angle. Now Selene has a criminal to catch while trying to stay out of the hands of government goons who have stripping her reanimation power on their agenda.
When Micah and Ilyse finally find a way to save her, Selene thinks she can cross one bad thing off her list--until she learns the terrible price that must be paid to keep her alive. Full plate doesn't cover it. Overflowing plate doesn't cover it. Selene's plate has damn near exploded.