Speak, Memory from Vladimir Nabakov.
One of the finest autobiographies of our time from one of the 20th century's greatest writers.
Also do get the 1999 (or later) edition. This is essential because it includes the unpublished last chapter, a pseudo-review comparing Speak, Memory with another, nonexistent memoir called When Lilacs Last. (That title refers to Whitman's poem on Lincoln's assassination and to the lilacs of Nabokov's childhood home)