At the University of Michigan, it took a hidden-camera sting operation to uncover the truth behind Heather Ames' mysterious problems with her experiments, says Nature's Brendan Maher. It was discovered that one of her colleagues, former postdoc Vipul Bhrigu, has been systematically sabotaging her work over the course of several months by tampering with her experiments and poisoning her cell culture media in order to get ahead of her, Maher says.