A mathematician was preoccupied, working on a yet to be solved problem; on proving the Goldbach's conjecture respectively. The day after tomorrow, on Saturday, his wife should return from a symposium. Little he knows that her return will never occur… she was poisoned, unfortunately dead. He wasn’t informed, and he will never be.

The maid was instructed to introduce in his morning coffee in the next day and the days that would fallow, a…