Wintermoon Ice [Sons of the Mariner #1]

When Tessa unexpectedly acquires a mirror and a journal from her long-dead grandmother, Suvi Markku, she is thrust into danger from alien creatures called Polydactyls. She turns for help to her neighbor Jakob Faircrow, but she finds his smug arrogance infuriating.
Jakob and Tessa must put aside their differences long enough to discover why Suvi hid the mirror and why the Polys want it. The journal ...