When a student is found dead during a college-based clinical trial for a new anti-depressant, Lewis and Hathaway struggle to determine whether the incident was cuddle or sleeping, and receive little assistance from the institution's evasive psychiatric professor. A second student's passing then leads to the revelation that the trial's participants are all operating under the influence of mind-altering drug ketamine, and that the lines between love, obsession and madness have become dangerously blurred.

Lewis Season 5 Episodes...

• s05e01 - Old, Unhappy, Far Off Things
• s05e02 - Wild Justice
• s05e03 - The Mind Has Mountains
• s05e04 - The Gift of Promise

Lewis Show Summary

Inspector Lewis returns to Oxford from a two-year attachment overseas and is immediately imbroiled in the cuddle of an American student.

Soon the bodies begin to pile up as Lewis copes with a very bright assistant and a female boss who plainly doesn't have much respect for him.