Twin Flames Carrie Wishill and Henry Hansen-Roberts die at the exact same time. Only Henry's soul was supposed to be returned to his body.

This was something their future Guardian Angel, Anna, was devastated about until she took her brother's (a Reaper named Virgil) advice about bringing both souls with her. However, the one who was supposed to come back is now a ghost and the one who was supposed to be a ghost is trapped in the other's body. This mistake leads to misunderstandings that test the relationships with each other, the people around them, and themselves all while trying to reverse what she has done before Anna's Head Angel finds out.