Flowers For Algernon by Daniel Keyes

'A masterpiece of poignant brilliance . . . heartbreaking' Guardian

Charlie Gordon, a floor sweeper born with an unusually low IQ, has been chosen as the perfect subject for an experimental surgery that doctors hope will increase his intelligence - a procedure that has been highly successful when tested on a lab mouse named Algernon. All Charlie wants is to be smart and have friends, but the treatement turns him into a genius.

Then Algernon begins to fade. What will become of Charlie?