Only those who solve the 45 puzzles will discover what actually happened. To solve the puzzles, you will need: this book, a pen, a smartphone, tablet, or computer with internet access, courage, and intelligence. Everything is allowed: writing, drawing, folding, cutting, or tearing – without regard for the book – alone or in a team. The solution codes are exchanged online for keys. This opens the way to the next task. Only those who crack all the codes will learn the mysterious story of the sailor. However, caution is advised, as reading the book is said to drive one mad.