Killing Season by Faye Kellerman

Three years ago, 16-year old Ellen Vicksburg disappeared.  One year after her disappearance, her younger brother, Ben, discovered her body . . . Devastated, he devotes his life and math and computer skills to finding her killer. 

Flash forward three years.  Ben is now a senior in high school and based on his extensive research thinks he’s found potential other victims, and the serial killer’s pattern, based on the changing seasons.  He’s also found a surprising ally in the beautiful new girl in his class.  But as his senior year nears its end, the hunt for the killer escalates and Ben finds himself – and his new friend – in mortal danger!

I did not want to put this down!!!

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