<p>New York Times bestselling middle-grade thriller author Margaret Peterson Haddix returns to the Mysteries of Trash and Treasure series as Colin and Nevaeh unravel a mystery from the 1930s and explore the emotions associated with death and dying.</p> <p>Colin and Nevaeh are great at finding things. After all, they found each other and became best friends--even though their parents are business rivals. They also found hidden boxes of secret letters, which led them to unravel mysteries about kids from the 1970s.</p> <p>But when they started Mystery Solvers Inc., they didn't expect to be asked to find a ghost.</p> <p>Ree recruits them to investigate a series of old, spooky photos left behind in her family's new house. The photos show a boy who looks totally see-through. And in some, he's in a coffin.</p> <p>That's not so odd for Ree, who lives above a funeral home. But when Colin and Nevaeh start investigating, they discover other sightings of the boy--and other secrets Ree is hiding.</p> <p>The more clues they find, the more they realize this mystery goes back to a time called the Great Depression. Will history, once again, help them solve the case?</p>