While Hannah Prentiss's cousin, Ryder, is exploring the local underground caves not far from Blackberry Valley, he stumbles on a cold case. Inside a remote cave, Ryder finds a backpack filled with personal items that once belonged to their great-uncle. Uncle Chuck was last seen entering the dangerous cave, with its many narrow passages and sharp drops, and there has been no trace of him since.
However, the items uncovered now indicate that their great-uncle walked out of this cave very much alive all those years ago, so where did he go? The more Hannah digs into Uncle Chuck's disappearance, the less things add up.
Can Hannah solve this decades-old mystery and give her family peace of mind?
Another good addition to this series. I continue to be amazed at how well the multiple authors are doing at keeping up the continuity from book to book. This one has some good stuff about self-worth, fear, bravery, and to keep trying even if failure happens. The mystery is a good one. There's not really a dual time-line, but there's plenty of hunting at the library for information about what happened some 60 years before. I enjoyed the book, and am ready for the next one!