A Rule Against Murder (Chief Inspector Armand Gamache, #4)

by Louise Penny

“The Morrows are mad,” Finney continued, either oblivious of the child or used to it, “because they’ve taken leave of their senses. They live in their heads and pay no heed to any other information flooding in.”

“We’re all blessed and we’re all blighted, Chief Inspector,” said Finney. “Every day each of us does our sums. The question is, what do we count?”