A Heart of Flesh — Casey Hays

For Justin Phillips, every single step is unpredictable.

He spends his days teaching self-control to five tiny, yet dangerous toddlers. Injected with an advanced mixture of the Serum, they are the last of Eden's legacy. The Indestructibles.

His commitment to train them has put his own life on hold, and their slow progress frustrates him. Soon, an anger begins to harden his heart -- to eat at his soul. Anger at Ian for leaving him to do all the work. Anger at his father for destroying his dreams of a different life. Anger at God for not answering.

His only comfort is Diana. His friend, his constant in the storm, she keeps him centered, focused.

He's afraid to let himself love her.

 When his Aunt Penelope discovers some unusual activity in the Serum, things heat up fast, and Justin finds himself running against time to save the children. But before he can save anyone, he must let go of his fears.

 He must trade in his heart of stone for the one God has waiting for him.