Imagine a drug that made your brain function to its full potential. A drug that allowed you pick up a foreign language in a single day. A drug that helped you process information so fast you could see patterns in the stock market. Just as his life is fading into mediocrity, Eddie Spinola comes across such a pill: MDT-48 - a sort of Viagra for the brain. But while its benefits materialise quickly, so do certain unwelcome side-effects.

Both a sequel and prequel to Alan Glynn's classic debut, which became the number one hit movie Limitless, Under the Night is an irresistible thriller about the seductive power and dangers of unlocking the human mind. 1950s Manhattan: Ad man Ned Sweeney finds himself an unwitting participant in MK Ultra trials, the CIA's covert study of psychoactive drugs. The experiment introduces him to MDT-48, a mind-expanding smart drug, which takes him away from his wife and young son and straight to the corridors of the richest and most powerful people of his day.