Everyone in my family has killed someone

I was dreading the Cunningham family reunion even before the first murder. Before the storm stranded us at the mountain resort. The thing is, us Cunninghams don't really get along. We've only got one thing in common: we've all killed someone. My brother, my step-sister, my wife, my father, my mother, my sister-in-law, my uncle, my step-father, my aunt. Even me. When they find the first body in the snow, it's clear that only a Cunningham could have committed the crime - and it's up to me to prove it. There are plenty of killers in my family. But only one murderer.