The summary is: 1) 'Seashell' is the latest science fiction novel by author Aiyuni Sun, set underwater like the author's previous book 'Current'. 2) The story is about Kayan, the 16-year-old son of marine scientist Professor Miraj, who discovers his father's secret when he stows away on a trip to his underwater laboratory. 3) Kayan realizes he and his father are in danger after discovering the secret of a locked room in the laboratory.