Review: Two slippery characters illuminate ‘The Art of a Lie’ in dandy novel

“I’m not a saint, William,” says Hannah, the main character in “The Art of a Lie.” She‘s not kidding. Laura Shepherd-Robinson, whose last book was a twisty bit of historical fun called “The Square of Sevens,” returns to the bad behavior of another era in “The Art of a Lie,” which is alternat…