Echoes of Alcott contribute to the intimate charm of this story of “summer and magic and adventure.” Not since the Marches have readers met more engaging girls than the Penderwicks: Rosalind, 12, pretty and practical; Skye, 11, smart and blue-eyed; Jane, ten, aspiring author, whose alter ego, Sabrina Starr, is fearless and clever; and butterfly wing–wearing Batty, four. Dear Father is a botanist, fond of spouting witticisms in Latin; Mommy is in heaven. This year, vacation will be spent at the cream-colored cottage at Arundel, estate of snooty Mrs. Tifton, whose house is “like a museum, only without armed guards.” Unless she has a change of heart, Jeffrey, her gentle, music-loving only child, is doomed to be sent to Pencey Military Academy, “Where Boys Become Men and Men Become Soldiers.” Despite a few mishaps, the children become fast friends and partners in the sorts of lively plots and pastoral pastimes we don’t read much about these days. Their adventures and near-disasters, innocent crushes, escaped animals, owning-up and growing up (and yes, changes of heart) are satisfying and not-too-sweet. (Fiction. 8-12)