The only piece of information that Summer Davis takes away from her years at Peninsula Upper School -- one of the finest in the Brooklyn Heights-to-Park Slope radius, to quote the promotional materials -- is the concept that DNA defines who we are and forever ties us to our relatives. A loner by circumstance, a social outcast by nature, and a witty and warm narrator of her own unimaginable chaos by happenstance, Summer hangs on to her interest in genetics like a life raft, in an adolescence marked by absence: her beautiful, aloof mother abandons the family without a trace; her father descends into mental illness, haunted by a lifelong burning secret and abetted by a series of letters that he writes to make sense of his feelings; her best friend Claire drifts out of Summer's life in a breeze of indifference, feigned on both sides; and her older brother fluctuates between irrational fury and unpredictable tenderness in an inaccessible world of his making.
