The Last Valkyrie Series by Karina Espinosa

Raven Romero lost the Sword of Souls, giving up the search for the only weapon that could kill Odin. Instead, she teamed up with human detective William Callahan to find the drug lord responsible for Venom—a narcotic leaving dead humans and supernaturals in its wake. But priorities change when a greater evil threatens Midgard and the only way to defeat it is with the sword. Being the humans’ champion isn’t easy, especially during withdrawal while trying to stay sober... moreRaven Romero lost the Sword of Souls, giving up the search for the only weapon that could kill Odin. Instead, she teamed up with human detective William Callahan to find the drug lord responsible for Venom—a narcotic leaving dead humans and supernaturals in its wake. But priorities change when a greater evil threatens Midgard and the only way to defeat it is with the sword. Being the humans’ champion isn’t easy, especially during withdrawal while trying to stay sober. And Raven is struggling with both. Enemies become friends and new enemies emerge as the hunt begins for The Sword of Souls. less

Raven Romero is willing to do whatever it takes to find her friends who were kidnapped by Hel—even if it means traveling to another realm for help. Meanwhile, the battle to save Midgard is upon them and Raven is scrambling to build an army in time to defend it, finding allies in the most unlikeliest of places. But enemies are everywhere and not everyone can be trusted. Maybe not even the ones closest to her. The end is near, and it’s time for The Rise of the Valkyries.