Shimmer (Riley Bloom Series #2)
Riley Bloom is perpetually 12 and is making her place in the afterlife as a soul catcher. She is stubborn and impulsive. When she is on vacation in St. John Virgin Islands, she comes up with a ghost of a young girl who was killed when the slaves on her plantation revolted and who isn't moving on because she is so angry. Riley needs to free the souls she has trapped with her and encourage her to move across the bridge into the afterlife.