That was what made it dangerous. Vanessa had not intended to kill him quickly. She had intended to weaken him slowly. A second substance explained his exhaustion and occasional confusion; together, the compounds could make his decline appear neurological.

Dr. Sutter, the specialist Vanessa recommended, had repeatedly called Graham’s condition stress-related despite several abnormal test results. When Benjamin Cross investigated the doctor’s finances, he found consulting payments from a company controlled by Vanessa’s older brother.

“It may be a coincidence,” Benjamin said.

“No,” Graham replied. “It isn’t.”

The deeper they looked, the uglier the plan became. Six weeks before Graham’s symptoms began, Vanessa had asked to review his estate documents under the excuse of wedding planning.

Graham’s will directed most of his personal fortune toward scientific research, public education, and programs supporting children with disabilities. A future spouse would receive substantial property and lifetime financial security, but not control of Mercer Ridge Technologies.