The book "Lieutenant at Eighteen" by Oliver Optik is an exciting adventure novel about young Tom Sperry, who fulfills his dream of becoming a naval officer at the age of eighteen. Tom's first steps in service on the ship "Gazette" are associated with great responsibility, friendship and important choices. During his sea adventures, the boy tries to prove himself as a true professional, face dangers and solve the mysteries that stand in front of him on the way. This book not only talks about the importance of friendship and loyalty to one's ideals, but also emphasizes the path to fulfilling dreams through hard work and the ability to take responsibility.