The first book Thor: Dueling with Giants in this three book series was so good that I couldn't wait to read this second one. And not only because Sif is the main character but because first book was very well-written and the characters so well researched that I can't wait to see what author does with Sif's story.
Book: Sif: Even Dragons Have Their Endings (Tales of Asgard Trilogy book 2) by Keith R.A. DeCandido
In the action-packed Sif: Even Dragons Have Their Endings, Marvel's Tales of Asgard trilogy tells of the adventures of another of the realm's greatest warriors.
When the nearby village of Flodbjerge is terrorized by a dragon, one of its citizens races to Asgard seeking the help of Thor. But with the God of Thunder incapacitated following a battle, it is Sif who must answer the call -- much to the villager's dismay. Despite being one of Asgard's most skilled fighters, Sif is used to being doubted.
She's also used to overcoming those doubts.
There's a reason Sif is known as the Unstoppable. But both her reputation and her life are on the line as she faces the fearsome dragon, Oter. The face-off won't be straightforward either -- the winged beast has a secret that Sif will have to unravel in order to defeat him before the village and its people go up in flames.