All the Bright Places by Jennifer Niven

Theodore Finch meets Violet Markey when both climb to the school's bell tower to contemplate what it would mean to jump.  Forever searching for a way to justify living, Finch combines two projects--a geography class assignment to visit special places in the state (Indiana) and helping Violet to deal with her despair at the recent loss of her older sister.  The pair's developing relationship is told in alternating viewpoints that contrast Finch's irrepressible nature and attraction to Violet with her reluctance to be associated with someone commonly known as Freak.  The dialog is witty and the teens are sympathetic and engaging. The book deals with  love, responsibility,  family dysfunctions, school bullying and peer pressure, and mental illness.  This is both a satisfying and heart-wrenching story.