Tarin of the Mammoths
I thought the pace of the story picked up when Tarin ran into another pair of travellers, brother and sister Kaija and Luuka, who have escaped a deadly illness that has struck down their own tribe. Book 2 is already out and it looks as if this may the start of a long series. There are certainly plenty of Ice Age hazards to keep our heroes busy. And while this is not The Inheritors, there is a passing encounter with a Neanderthal boy which promises further interaction in the future.