SPOILER at the end of the novel the murderer falls into a ravine and dies, it is unclear if he is killed but the fall or by the impact of the icicle that causes the fall.
Bittersweet. SPOILER The novel ends with the narrator managing to move on in the afterlife, and she seems to get revenge on her murderer. At the end of the day it is still a novel about a young girl being murdered so no part of the novel can really be described as happy.