Gossip Can Be Murder by Connie Shelton, (Charlie Parker Mystery, book 11) from Books In Motion.com

Charlie is invited to a plush Santa Fe spa, a week-long spiritual/nutrition retreat with her friend Dr. Linda Casper. The massages and spa treatments sound great, until she realizes that there is something darker going on at the mountain resort. Meanwhile, Drake has his own set of concerns. He's been asked to testify as an expert witness in a helicopter crash case and it's causing him more anxiety than any feat of flying ever did. It seems that they are each on their own but their two cases overlap and dangers abound, from all sides.