"Determined to find answers as to why her older sister committed suicide, Sloan searches a list of places and people her sister left behind." --,(Source of summary not specified)

Ever since her older sister Talley died, Sloane has been fixated on a list of random places, unfamiliar names, and a phone number for a boy named Adam. Is the list the key to understanding why Talley took her own life? But it seems to be pointing to California, and Talley had never even been there... right? Adam claims he'd never met Talley, and he is clearly hiding something, yet Sloane is drawn to him. Is she ready to learn the truth about secrets her family has been hiding for years? -- adapted from jacket