This is actually 3 books in one and I was so excited when it came out! Each book is about different children throughout different time periods in Odyssey's history who end up finding themselves in another world (reminiscent of Narnia). The world, Marus, parallels the bible in which each book is a bible story come to life, though with a very different setting and intriguing twists. My favorite book within Passages Volume I is "Darien's Rise". My church adapted this into a play and it was incredible! The story tells about King David's rise--before he becomes king and after he is enthroned. It's an incredible story, though I recommend all of them. My children love them and they can't wait to read Volume 2!
The Passages books have captivating stories full of good moral lessons and character-improving scenarios. It's also fun to figure out what Bible story the plots are similar to.