For almost a decade, Kale's been trying to control his "super power." Defeated and unsuccessful, Kale has given up hope of a normal future—one that doesn't involve gunshots and blood. The inevitable pull to the past makes tension between Kale and his father, who, despite Kale's efforts, does not believe him when he says he can time travel. However much he dislikes it, he can't prevent himself from being sucked into the long, cold years of World War II. Until he meets Harper, his old next-door neighbour who has moved back to town, no one believed him.

Kale and Harper become reacquainted after years of separation, both wanting to help the other. It doesn't take long for the two to fall in love, as if it was fate. But Kale knows he has to tell Harper the truth before things between them get too far—even if Harper is willing to accept his upcoming disappearance.

After Kale comes clean about why he always vanishes, Harper is determined to help Kale remain in the present and resist the call to the past, no matter what Kale says. Harper's mission is fueled by an article that says that Kale will die fighting in World War II. As his time dwindles, Kale must face his inner demons, for they could be the only way to keep in him from dying an inevitable death.

I loved the themes of family, friendship, and perseverance in this book. I thought the author, Gwen Cole, did a great job blending the supernatural with romance and modern life. In my opinion, Gwen Cole wrote an effective first-person narrative that alternates between Kale and Harper. It shows their feelings and thoughts for each other. I would recommend this book to teens who like the romance and modern fiction. The characters are thoroughly explored and relatable. The love story between Kale and Harper is sweet and charming. Despite the plot, the book is quite calm and mellow. I would not recommend it to teens who live for action and major conflict like myself. To summarize, I believe Cold Summer is a nice book with a great storyline and backstory.