Janina Ramirez 
Way of the Waves [PDF ebook] 

Join young investigator and shield maiden Alva as she goes a-viking around the medieval world in search of adventure! Alva clings to her sleeping wolf as the Viking longship pitches and rolls over the North Sea’s crashing waves. Soon she will reveal herself as a secret stowaway, but only when there’s no chance of turning back. This is her opportunity to put her shield maiden spirit to the test — exploring strange new lands, solving mysteries, and most importantly finding her father . . .