The Scene of the Crime by Victoria Hislop is set partly in Chios and deals with the legacy of the 1822 massacre and its effects on subsequent generations. Hislop writes about Greece with genuine knowledge; this is a useful companion for anyone visiting the ossuary at Nea Moni.
Massacre at Chios — the primary historical account of the 1822 events is scattered across various histories of the Greek War of Independence; Philip Mansel's Levant (2010) provides good context for the broader Ottoman Aegean world of which Chios was part.
The Mastic Tree and the Mastichochoria — various short books in Greek and English are available locally in Chios and cover the mastic villages and their culture in more detail than most travel books reach.