Who is Arrington Carter from Dead in the Water: A Novel and what is their importance?

Arrington Carter is a magazine writer with whom Stone Barrington has had a live-in relationship. Arrington is supposed to have come on this trip with Stone but instead she becomes involved in an interview with Hollywood heartthrob Vance Calder. This interview turns into a relationship. In fact, Arrington marries Calder while Stone continues to believe they still have a relationship. Stone is heartbroken by this news but he too has moved on to a new relationship. In fact, Stone is having a sexual relationship with Allison while still hoping to be with Arrington.