“They thought it was an enemy but it was their own reflection,” writes Giles Foden in his harrowing 1998 novel, The Last King of Scotland. Tracking Ugandan president Idi Amin’s rise to power through his increasingly close relationship with a Scottish medic, this thriller examines loyalty, showing how it slides into complicity and corruption. Adapted for the screen in 2006, Foden’s taut, tense drama is now at the Crucible Theatre in a new stage adaptation by Steve Waters. —C.J.F.