Nate is a four letter word that is the crossword solution for the term 'Great Kid-Lit Sleuth'. Nate is the main character in the popular children's book series, Nate the Great, written by Marjorie Weinman Sharmat. The series follows the adventures of Nate, an 8-year-old detective, as he solves mysteries with the help of his trusty dog, Sludge. The books have been praised for their humor and clever plots, making them a favorite among young readers.