I picked this one up at the library on the recommendation of 3M at 1morechapter. It was absolutely sublime! The novel tells the story of a housekeeper contracted to keep house for a math professor. The professor was involved in an auto accident that damaged his brain. He can no longer form long term memories and his short term memory lasts only eighty minutes.
What follows is the touching tale of how the housekeeper and her ten year old son befriend the kindly old teacher, despite his mnemonic handicap. It is a wonderful story of math, baseball, and unconditional love. I second 3M's high recommendation!