"Pen-pal" by Stephen Marlowe is an exciting psychological thriller that keeps you in suspense from the first pages to the last. The main character, an ordinary guy from a small town, suddenly starts receiving letters from a stranger who seems to know him very well. The further, the more these letters go beyond the ordinary, revealing dark secrets of the past and prompting the main character to extreme actions. The author masterfully weaves the plot, confusing the reader and making him feel tension and anxiety until the very end. "Pen-Pal" is a book that will leave you impressed and make you think about the value of the secrets we hide from others and from ourselves.