Lewis

Hathaway and Lewis struggle to determine whether a death during a college-based clinical trial for a new antidepressant was murder or suicide, and receive little assistance from the institution's evasive psychiatric professor. A second student's demise then leads to the revelation that the trial's participants are all operating under the influence of a mind-altering drug, and that the lines between love, obsession and madness have become dangerously blurred. Guest starring Douglas Henshall (Primeval), Lucy Liemann (Rev) and Thomas Brodie Sangster (Love Actually)