Narrated by the most daring member of a mischievous trio, this is the incredible but funny story of Indian Island, site of ghostly apparitions, secret caves, Indian burial mounds and hidden treasure. It all begins when Chubb, Spider and Kenny set out to welcome Professor Quimby, a researcher and archaeologist who is interested in exploring Indian Island. Unexpectedly the boys find the professor on the island long before his specified arrival date. Invited to assist the professor, the boys discover a watery tunnel in which the real Professor Quimby and his authentic Indian companion have been imprisoned for days. The imposter is identified as Frank Canning, a notorious jewel thief, believed to have perished in a fire. The jewels also turn up, at the bottom of a cistern, and the tenacious sleuths triumph. There is a good deal of outlandish plot here, but Spider's narration is humorous enough to keep, at least, the avid mystery fan reading on.