London, 1923. Newly minted research assistant Saffron Everleigh attends a dinner party for the University College of London. While she expects to engage in conversations about the university's large expedition to the Amazon, she doesn't expect Mrs. Henry, one of the professors' wives to drop to the floor, poisoned by an unknown toxin. Dr. Maxwell, Saffron's mentor, is the main suspect, having had an explosive argument with Dr. Henry a few days prior. As evidence mounts against Dr. Maxwell and the expedition's departure draws nearer, Saffron realises if she wants her mentor's name cleared, she'll have to do it herself.
