Christine Chamberlain doesn't want much from life: a steady job, a baby and a Fields Medal. Her boss, however, wants money and he is willing to do anything to get his way, even if it means getting Christine involved in a project that not only jeopardises her dreams, but might also put her in danger.
When Christine complains to her colleagues, they joke about killing the boss to solve the problem. They discuss the murder by email. Almost everybody has an obvious motive to get rid of the boss from hell... and a few hidden ones they don't share.
The next day, Christine brings fennel oil to work. In itself, it's not the world's deadliest poison, and Christine would of course never dream to use it as such. Or would she?