L'Engle, Madeleine

"Charles Wallace Murry is old enough to start school, but his sister, Meg, and their friend Calvin know he isn't cut out for classes on Earth--Meg worries that he'll be more misunderstood than ever. Luckily, with the help of the three celestial creatures Mrs. Watsit, Mrs. Who, and Mrs. Which, there is another place where Charles Wallace can get his education: Intergalactic P.S. 3, a public school in a different galaxy. The three children travel through time and space to reach the school, but to earn admittance, each must pass an unusual exam. Meg's test will challenge her inner strength, her perspective, and her ability to protect the ones she loves"--Provided by publisher.

Meg Murry, her brother Charles, and their friend Calvin, embark on a journey through space and time, assisted by three other worldly women, when they set out to find Meg's father, a physicist who disappeared while experimenting with time travel.

With Meg Murry's help, the dragons her six-year-old brother saw in the vegetable garden play an important part in his struggle between life and death.

A marine biology student reporting to his summer job on an island off Portugal finds himself at the center of a power struggle between his boss and another group of Americans.