In her memoir, Fiona Hill extends her riveting testimony from Donald Trump's first impeachment trial. And while she might not dish as much dirt as other Trump-era memoirists, the former senior National Security official writes movingly about Trump and about polarization and other threats to American democracy. She points to Russian history to suggest that distrust in government and political systems can lead to collapse. And while she describes Trump as the symptom of that division and distrust, she also says he put a spotlight on what needs fixing.