Michael Dahl 
Twilight of the Gods [PDF ebook] 

The death of Odin’s beloved son, Baldur, heralds the end of all creation – but also a new beginning. But before life can begin again, all must die – including the gods and goddesses themselves. In a battle of epic proportions, Loki and his sons, Surtur and the Giants wage war on the Viking gods. With the fate of the known world hanging in the balance, all bets are off – but one thing is certain: death is not the end, and the end is just the beginning.