Possible Clues:

• Departure of the Israelites led by Moses
• Book two, or 'deux' -- so complicated?
• Book a journey across the Red Sea
• Mass migration
• Sued wrong officer involved in The Leaving
• Old Testament escape
• Book that's the source of the phrase "a land flowing with milk and honey"
• Book coming out?
• ... book flight?
• Departure; book of Bible