The line between here and gone : [a Forensic Instincts novel]

Summary: Each day is a struggle for Amanda Gleason's newborn son as he battles a rare immune deficiency. Justin's best chance for a cure lies with his father, who was brutally murdered before Amanda even realized she carried his child. Or was he? One emailed photo changes everything, planting a seed of doubt that Amanda latches on to for dear life: a recent photo of a man who looks exactly like Paul. Forensic Instincts is the one team up for the challenge of tracking him down. A behaviorist, a former navy SEAL, a techno-wizard, an intuitive, a retired FBI agent, a human-scent-evidence dog-- together they achieve the impossible, pushing ethical and legal boundaries whenever the ends justify the means. The manhunt is on for the elusive father. Yet the further FI digs into his past, the more questions are raised about whether the man Amanda fell in love with ever really existed at all.