Helen Trilogy

Helen Trilogy is a sub-series of the <a href="/c/books/credit/318304/agent-pendergast/">Agent Pendergast</a> series written by <a href="/c/books/credit/85748/douglas-preston/">Douglas Preston</a> and <a href="/c/books/credit/85749/lincoln-child/">Lincoln Child</a>. • Fever Dream (2010) • Cold Vengeance (2011) • <a href="/c/books/book/805144/two-graves/">Two Graves</a> (2012)