"River Marked," a novel by Patricia Briggs, continues the story of Mercy Thompson, a mechanic and shapeshifter. Set in the urban fantasy genre, Mercy and her mate, Adam, the alpha of the local werewolf pack, seek a peaceful life together. They decide to take a river rafting trip to celebrate their union, hoping to escape the chaos of their usual lives. However, their plans are disrupted when they encounter a supernatural threat lurking in the waters, revealing that their problems are far from over.
The story delves into the complexities of Mercy's identity as a Native American shapeshifter and how her heritage influences her understanding of the spirit world. As they navigate through dangers, Mercy’s bond with Adam is tested, and she confronts challenges that require her to harness her unique abilities. The adventure also highlights the importance of community, loyalty, and the connections between different supernatural beings.