I wasn't able to get this into the last bread but, that tweet of Bill Clinton about R.I.P. Sue Grafton, the alphabet mystery writer of "A is for Alibi" and "Y is for Yesterday", is definitely a coded message.
In Y is for Yesterday, the plot is nasty. Four upper class male students rape and torture a 14 year old boy. They video tape the rape. Conveniently, two of the four assailants are murdered. The video tape goes missing and the remaining two assailants walk free. In the fire today, evidence against them now destroyed? Alibi now intact? Message to Hillary? Definitely a coded tweet!