A Ghostly Blue

Sam hasn't seen, heard, or felt a ghost in months, but that changes as soon as he and Rocky explore an abandoned indigo plantation in Charleston, SC. First: A ghost steps out of a mirror, tells them to run away, and then flies straight through Sam. Second: Sam feels an angry ghost who leads him to an old vat, then it forces him to watch cryptic letters carved into the old wood by an unseen hand. Third: They meet the ghost of an enslaved boy who wants to get back to his family. With three mysteries to solve, Sam and Rocky take advantage of some ghostly help to piece together what happened in 1762. But with only a few days left of spring break, do they have time to dig deeper and uncover the truth? Or will the ghosts remain trapped on Earth?