Death in the Time Of Ice (A People of the Wind Mystery, #1)

Enga Dancing Flower knows her Neanderthal tribe is in trouble. The dark seasons are becoming longer and the mammoth herds are fleeing south. When the tribal leader is found stabbed to death, the new leader thinks Enga did it. Expulsion and certain death loom. Enga must find the murderer to save her tribe -- and herself.