"The Door to Summer" is a science fiction novel by the American writer Robert Hylen, in which the author depicts the story of Daniel Boyd, an inventor who invented a time travel machine. This book combines elements of science fiction and detective, creating an exciting plot with unexpected twists. The protagonist of the novel, Daniel Boyd, decides to use his discovery to change his destiny. However, he faces a number of unforeseen difficulties and losses, and also faces ethical dilemmas related to changing events in the past. The reader submits to the tense atmosphere of the book and ponders the questions of the impact of our actions on the future. "The Door into Summer" is an exciting journey into the mysterious world of time, which will leave behind many thoughts and impressions.