Right understanding fosters right living. Here are a few books to help young and old alike grow in their faith. Most of these books are under 200 pages!
To Read Scripture Better
Cross Talk: Where Scripture and Life Meet by Michael R. Emlet (Crossway, 2010), 224 pages
Dig Deeper: Tools for Understanding God's Word by Nigel Beynon & Andrew Sach (Crossway, 2010), 147 pages
The ESV Study Bible (Crossway, 2008)
To Understand the Bible's Big Picture
God's Big Picture: Tracing the Storyline of the Bible by Vaughan Roberts (IVP, 2002), 156 pages
The True Story of the Whole World: Finding Your Place in the Biblical Drama by Craig G. Bartholomew and Michael W. Goheen (Faith Alive, 2009), 171 pages
To Grow in Grace
Gospel: Recovering the Power that Made Christianity Revolutionary by J. D. Greear (B&H, 2011), 248 pages
The Cross Centered Life: Keeping the Gospel the Main Thing by C. J. Mahaney (Multnomah, 2002), 85 pages
To Fight Sin
Battling Unbelief: Defeating Sin with Superior Pleasure by John Piper (Multnomah, 2007), 155 pages
Respectable Sins: Confronting the Sins We Tolerate by Jerry Bridges (NavPress, 2007), 181 pages
To Live a Great Life
Don't Waste Your Life by John Piper (Crossway, 2007), 179 pages
Humility: True Greatness by C. J. Mahaney (Multnomah, 2005), 172 pages
Rescuing Ambition by Dave Harvey (Crossway, 2010), 216 pages
To Worship God for Who He Is
The Difficult Doctrine of the Love of God by D. A. Carson (Crossway, 2000), 84 pages
The Knowledge of the Holy by A. W. Tozer (Harper Collins, 1961), 117 pages
For Kids
The Jesus Storybook Bible: Every Story Whispers His Name by Sally Lloyd-Jones (ZonderKidz, 2011)
The Big Picture Story Bible by David R. Helm (Crossway, 2004)
God's Names by Sally Michael (P&R, 2011)