Ancient Sword Unyielding - Luke Irontree & The Last Vampire War, #9

The Vampires are stockpiling silver. And Luke wants it. After a raid goes bad, Luke discovers the vampires are buying silver. He and his army of vampire hunters have been using silver buckshot to take out the fangers. But when they turn the tables, he fears for the lives of his werewolf allies. Thanks to a tip, Luke finds the location of a vampire stockpile. The only problem is that it's inside an impregnable vault.
To get it, he must assemble a team of specialists to pull off his biggest heist ever. In this deadly game of vamps and robbers, one mistake could mean death. Luke must keep ahead of the vampires and hope no one betrays him. If he doesn't, he'll lose everything he's fought and sacrificed for.