Invitation to Die by Helen Smith

http://www.amazon.com/Invitation-Die-Emily-Castles-Mysteries-ebook/dp/B00BCLBHSA

Invitation to Die is a fun British mystery set at a romance authors’ conference in London. When one of the delegates goes missing, twenty-six-year-old amateur sleuth Emily Castles teams up with eccentric philosophy professor Dr. Muriel to investigate.

"Helen Smith has created a great little cozy series with the charming Emily Castles." Criminal Element