Susan Keown takes us through the twists and turns of a clinical mystery—why a cancer that responded to T-cell immunotherapy became resistant. Susan (@sejkeown) won the 2019 Best of the Northwest Science Institutional Writing Award for her story, “Revealing a new way that cancer can evade immunotherapy — and, maybe, how to stop it,” about how @fredhutch scientists solved the mystery and honored the memory of one patient. image: NIH