A Lethal Betrayal - The Ritchie and Fitz Murder Mysteries, #6

Murdina Ritchie left her childhood home of Buennagel when a volatile, very alien species abducted her father during a failed diplomatic meeting. Six years later, she finds herself flying back. Her best friend Shackleton Fitz IV needs her help. His father's increasingly bizarre behavior demands an explanation. And Ritchie and Fitz specialize in finding explanations. But when another guest at the house dies when brutally attacked their first night home, Ritchie and Fitz find themselves caught up in two cases.
Someone in the house is the killer, and anyone in the house could be next. A Lethal Betrayal, Book 6 and the concluding chapter in the Ritchie and Fitz Sci-Fi Murder Mysteries.