A Christmas Carol
From Memory Alpha, the free Star Trek reference.
A Christmas Carol is a story written by Charles Dickens. It depicts the haunting of a miserly character named Ebenezer Scrooge by four spirits, who are determined to teach him the meaning of Christmas, so he may regain his holiday spirit.
Data employed a holonovel of the story to study "method acting". He attempted to discover emotions of his own by recreating them in performance through this technique. Data noted the way fear was used to motivate the evil Scrooge to redeem himself. (TNG: "Devil's Due")
The Doctor recommended that Seven of Nine read the story, as it would have "educational value". (VOY: "The Omega Directive")
Tom Paris related to Harry Kim that the reason he confessed and lost his commission and was sent to prison was "those three dead officers came to me in the middle of the night and taught me the true meaning of Christmas". (VOY: "Caretaker")
