Gods of Risk (The Expanse #2.5)

As tension between Mars and Earth mounts, and terrorism plagues the Martian city of Londres Nova, sixteen-year-old David Draper is fighting his own lonely war. A gifted chemist vying for a place at the university, David leads a secret life as a manufacturer for a ruthless drug dealer. When his friend Leelee goes missing, leaving signs of the dealer's involvement, David takes it upon himself to save her. But first he must shake his aunt Bobbie Draper, an ex-marine who has been set adrift in her own life after a mysterious series of events nobody is talking about. Set in the hard-scrabble solar system of Leviathan Wakes and Caliban's War, "Gods of Risk" deepens James S. A. Corey's acclaimed Expanse series.