What is the book "a wrinkle in time" all about?

There is a girl named Meg Murray who falls pretty short in her academics and gets into trouble quite often, her brother Charles-Wallace is incredibly smart though and is seen as weird. Meg and Charles-Wallace meet a boy named Calvain Kein while they are walking there dog one day and the three of them go into an abandoned house where Ms. Whatsit Ms. Who and Ms. Which are residing. They then return home and Calvain stays for dinner. Meg helps him in math and he helps her in english. The next day they begin there trek along the universe to find Megs father using whats called a Tesseract. They go onto many planets but finally they go to a planet where everything is controlled by this algorithm. The trio then meets a strange man who controlls charles wallace. They find Meg and Charles dad but Charlie is still being controlled by the dark thing so they leave him behind and go to a planet where there is no light. These strange furry aliens heal Meg and she battles the dark thing for her brother. In the end, Meg wins and tesseracts home. This time however her tesseract is beautiful. It has all these colors. Her mom and dad reunite and their adventure ends. Or does it?

it about some kids looking for mr.murry megs dad

Explanation:

"the sandy walls seemed to collapse in on themselves"

and

"the bloodshot waters seemed to have no bottom"

well i need the text ?   *   *   /