I highly recommend Raymond Cardinal Burke's book Divine Love Made Flesh. I believe it is an excellent book for old and new Catholics, catechumens, and high school students about age 14. This is a basic book which covers most of the solid teaching on the Eucharist. Although the Cardinal concentrates on St. John Paul II's Ecclesia de Eucharistia and on the Pope Emeritus' Sacramentum Caritatis, he covers other authors as well. He also examines Deus Caritas Est, mostly likely my favorite of the Pope Emeritus' writings.
Two of the sections which struck me at this time, (as this is a book one can return to and find new insights), was the one on the priesthood in relationship to the Eucharist, which I found particularly profound and moving.
The second was the section on the communal aspect of the Sacrament, a topic important at this time with all the confusion on the reception of Communion by those outside the laws of the Church. The Cardinal's review on the meaning of "communion" is timely.
I think all Catholics would find this book consoling as well. That the Eucharist is the center of our faith makes this book important. May I add that the Cardinal's style is concise and clear.