In “The Assassination of Margaret Thatcher,” Hilary Mantel’s trademark gifts of penetrating characterization, an unsparing eye, and rascally intelligence are once again fully on display with stories of dislocation and family fracture, whimsical infidelities, and sudden deaths with sinister causes. Cutting to the core of human experience, Mantel brutally and acutely writes about marriage, class, family, and sex. Unpredictable, diverse, and sometimes shocking, “The Assassination of Margaret Thatcher” will brilliantly unsettle the reader in that unmistakably Mantel way.