In A Wrinkle in Time, how do the characters take on the problem?

The main
characters in the novel are faced with the problem of bringing Dr. Murry home from the planet
Camazotz, where he is being held prisoner. Their biggest challenge is confronting the evil that
has taken over Camazotz. The face of that evil is "IT," a disembodied brain that wants
to synchronize everyone into total conformity to its will.

Meg and Charles
Wallace, two of Dr. Murry's children, are sent to rescue him, along with their friend Calvin.
Before they get to the planet, they have the help of the three mysterious women, Mrs. Whatsit,
Mrs. Who, and Mrs. Which, who offer them "gifts" to fight the power of...