Listed Measurements: 6-foot-1/8, 200 pounds
2018-19 year, eligibility: A junior academically, Book has three years of eligibility remaining, including the 2018 season.
Depth chart: Book will back up senior Brandon Wimbush this fall, deemed “1B” by Irish head coach Brian Kelly after the spring-concluding Blue-Gold Game. Book is entrenched enough in the position to lead to sophomore Avery Davis working at running back and receiver, but he will obviously now have to hold off the challenge of incoming freshman Phil Jurkovec.
Recruiting: Book’s recruitment was led by former Notre Dame quarterbacks coach Mike Sanford, having pursued the California-product while at Boise State before joining Kelly’s staff.