Something unthinkable happens: One of the Kindred Embraces a Kinfolk. Sadly, but with absolute resolve, the tribe demands the new vampire's destruction. The Garou want the killing to be quick and merciful. They give the job to a trustworthy and unflappable group of assassins - the player characters.
The complicating factor is that at least one of the Kinfolk has a reason to be reluctant. Perhaps the Leech is an old friend, lover or even a relative. The Kinfolk character understands all the reasons why the Leech must die, but none of them stop her from having second thoughts. If the vampire pleads for his life, it makes the killing all the more difficult. Maybe he's ashamed and horrified at what's happened, but self-preservation is a strong instinct.
What neither the werewolves nor the kinfolk realize is that they might be stepping on some powerful Kindred's toes. What if the new vampire is a prince's childe or the progeny of a Justicar? The neonate's death might start a war no one wants.
Whatever results, this story is emotionally loaded. From a Garou viewpoint, executing the vampire Kinfolk is absolutely the right thing to do. Yet it shouldn't be an easy task, physically and psychologically. Even a neonate vampire is no easy mark, especially not one desperate to save himself.