Amal El-Mothar and Max Gladsonte's "This is How You Lose the Time War" follows two agents, Red and Blue, on opposite sides of a war that spans all of time and (some of?) space across multiple universes.

Each chapter starts with a snapshot of what each agent is doing to advance their side's cause, whether that's taking part in major historical events or planting the seeds for 'coincidences' in the future, and ends with the discovery of a letter from their counterpart. What begins as acknowledgements of respect, nods across the battlefield, gradually grow into something more.

Fans of science fiction may be disappointed by the lack of focus on the time-traveling, universe-hopping backdrop to this story of star-crossing lovers. Details are sparse, and little is disclosed about the factions or why they are at war other than hints and impressions throughout the book.

The gradual, tip-toeing romance between Red and Blue via their elegantly composed letters is the strength of this book. There is a sweetness as the characters, hovering just beyond what one might call "human", discover that they are capable of such love, and for who should be their mortal enemy, no less. Readers who never tire of "Romeo and Juliette" will find much to love in "This is How You Lose the Time War".