Rejected Mate, Restless Ghost

An Alpha is matched with a mate, and he can reject her; the pack healer's title can be taken away from whoever holds it. Chloe was Derek's mate and he rejected her. She held the healer title until it was taken from her. Selena committed crimes and Derek made Chloe answer for them. Chloe died three years ago. Her sister Zoe was left without her medicine and died as well. Derek knows none of this when he comes into Chloe's cabin, finds it empty and tells her to take the blame for Selena one more time. Chloe's ghost is there while he threatens her dead sister and repeats what Selena has told him. He gets to the truth of it in the end, that both sisters died because of the woman he picked, and that Selena's part in it can now be shown and Chloe's name cleared.