Engaging enough to see me through 22-hours of driving; in other words, good pacing overall and engaging plot line. Occasional unexpected twists couple with entirely predictable ones to make for an average narrative quality, but the premise itself is quirky enough to lift it into the above-average. Overall the characters don't exactly shine outside of their extraordinary circumstances, or exhibit a tremendous depth, and certain elements--including the introductory chapter & the birth scene--lapse into a saccharin romanticism that threatens to diminish the overall quality of the novel. By the end of the book, Tim's desperate situation makes the maudlin tone of the opening passages understandable, but it was so over-the-top that I tossed the novel aside upon initial attempt to read it. The prose is distinctly unremarkable, but that makes it easy to follow on a car ride; basically enjoyable in audio format and fun to consider some of the practical implications of someone with spontaneous time travel disorder.