The girl with kaleidoscope eyes : a Stewart Hoag mystery / David Handler.

Enhanced descriptions from Syndetics:

One-hit-wonder author turned ghostwriter and amateur sleuth Stewart "Hoagy" Hoag and his persnickety basset hound Lulu are back for their first appearance in twenty years....

The year is 1992. Clinton is on the road to the white house, Kurt Cobain fever has taken over America's youth, and cell phones are the size of your head. Hoagy is pulled back into the orbit of the brilliant, erratic, maddening poet Reggie Aintree, whom he was deeply in love with before he met his ex, Merilee Nash. Reggie and her sister Monette believe they've been contacted by their long-lost father from whom they've been estranged for decades. Richard Aintree wrote one captivating novel that is read in every high school English class. But he fell off the face of the earth after his wife (the girls' mother), a distinguished American poet in her own right, committed suicide on a bad acid trip in the '70s.

To complicate matters further, Monette found her first taste of fame at twenty-years-old when she published Father Didn't Know Best, a memoir falsely accusing her father of sexual abuse. Though she tried to recant her accusations in subsequent books, the damage was done. She and her sister Reggie have not spoken since. Now, Monette is a media mogul whose empire is crumbling, and Reggie runs the Root-Chakra Institute in Upstate New York. Recently, both sisters have received mysterious typewritten letters from their father.

Into this crazy mix comes Hoagy, who is staying in the pool house at Monette's Brentwood mansion after he's been hired as a ghostwriter to document the tell-all book that could result from this mess. But when murder strikes, it's more important than ever for him to pull fact from fiction as he races to catch a clever, sinister killer.