The protagonist of the novel 'A Wrinkle in Time' is Meg Murry, a young girl who embarks on a journey through time and space to save her father. Meg is a brave and determined character who is willing to take risks to protect her family. She is also a strong-willed individual who is not afraid to stand up for what she believes in. Meg is a three-letter name, which is the answer to the crossword puzzle.