An afternoon at the lake leads to the discovery of a submerged car under the murky water. Keenly curious about the rusting hulk of metal, the kids devise a recovery plan that almost costs Alex her life. Once surfaced, the car becomes a key clue in a ten-year-old mystery, heating up the cold case as Josh, Alex, and Mickey once again tangle with Vinnie in their quest for answers, not realizing those answers could change their lives forever. You might think that surviving a plane crash and tangling with organizing criminals would encourage the kids to lie low for a bit, but adventure is always on the menu when it is Summer at Eagle Mountain.