In searching for this classic work, as recommended by Laura Woods, I found this abbreviated, annotated version of the 15 most heroic stories, from Wilmot H. McCutchen. I also ordered a 1911 hardback copy of Plutarch's Lives For Boys and Girls: Being selected lives freely retold by W.H Weston, for our home school library.
An interesting project would be to translate these English versions into Ancient Greek, using the full versions as a guide to vocabulary and style. Ah, but look at the time, Amici. Schade.