A year after her mother's death, Hannah resumes her training at one of the country's top teaching hospitals. She is soon terrified by strange visions and the threatening behaviour of her ex-boyfriend and star surgeon Nick and wonders if she has come back too soon. But beneath the hospital's reputation of medical excellence she discovers a secret network of dangerous experiments pushing back the boundaries of science. / Pulse was written by Paul Cornell from a story by Ben Teasdale. The show was created by Paul Cornell, Ben Teasdale and Tom McRae. (Source: BBC Three)