When Red Sox first baseman Mo Vaughn strides to the plate, he radiates energy and power. With one mighty swing, he can turn a two-run deficit into a two-run lead. And in the field, he makes the plays that count.

But it hasn’t always been this way. Only through hard work, determination, and a willingness to learn did he find his way into the majors — and the top statistics of the American League. But even when he was named League MVP in 1995, he made himself a promise to keep working, keep learning, and keep improving.

In this exciting biography, Matt Christopher, the number one sports writer for kids, goes to the plate for an inside look at Mo Vaughn, whose on-field stature is rivaled only by his off-field commitment to helping those less fortunate than himself.