His assignment from Satan was to kill Pastor Craig Groeschel. Today he sits on the front row of that pastor's church.

For twenty years of his life, Michael Leehan lived and worked for Satan. At age 33, he made a decision to serve the darkness that he felt had consumed his life, but instead of making things easier, it began a steeper downward spiral replete with ritualistic cuttings, blood sacrifices, jail time, job loss, estrangement from his friends and family, and actual murderous assignments from Satan himself.

Ascent from Darkness relates Michael's...