Showing Poison Pen by Sheila Lowe

Before her body is found in her Jacuzzi, publicist to the stars Lindsey Alexander had few friends, but plenty of enemies. Yet, police are willing to accept the words scrawled on crumpled piece of paper nearby as evidence of suicide.

When handwriting expert Claudia Rose is called onto the case, she has a different opinion. And when her instincts push her to investigate further, Claudia finds herself entangled in a far darker scenario than she could have imagined.