Although Big Shark Mark might look like the toughest fish in the sea, he has a secret; Big Shark Mark is afraid of the dark! When Mark accidentally finds himself in the deep, dark ocean, he is befriended by Spark, a small angler fish who helps Big Shark Mark feel brave. This rhyming story depicts the forming of an adorable friendship and shows readers that while everyone may have fears, having a friend to talk to can be a comforting light in the dark!