Kevin Finn (Jason Ritter, "Parenthood"), a cluelessly self-serving person, is on a dangerous path to despair. In a downward spiral, Kevin returns home to stay with his widowed twin sister (JoAnna Garcia Swisher, "Once Upon a Time") and niece. On his first night there, an unlikely celestial being named Yvette (Cristela Alonzo, "Cristela") appears to him and presents him with a mission -- to save the world.