Sliver Moon — Jay Brandon

Murder by Moonlight.

There's but a bare sliver of moon on the dark night when a shot rings out and a man falls, dead, from the balcony of child psychologist Anne Greenwald's father's house during a party. Anne and her boyfriend, District Attorney Chris Sinclair, both see the shooting, but can't agree on who pulled the trigger.

The dead man was involved with Anne's father in political deals with shady implications. Investigating, Sinclair finds a wall of silence built of blackmail, bribery, coercion, and intimidation covering up dirty politics that will send Anne's father to prison unless Sinclair can clear him.
As the trail of evidence leads Sinclair ever higher in Texas government, the killer gets bolder, stalking Anne … and Sinclair's teenage daughter, Clarissa. Sinclair is running out of time to solve an impossible murder.