Thrawn Ascendancy: Lesser Evil is a science fiction novel by Timothy Zahn, the third and final book in the Thrawn Ascendancy trilogy. The novel takes place in the Star Wars universe and follows the story of Grand Admiral Thrawn as he investigates a series of mysterious attacks on the Chiss Ascendancy. Thrawn soon discovers that a powerful enemy is at work, and he must use all of his cunning and skill to save the Ascendancy from destruction.

Lesser Evil is a fast-paced and exciting read that will keep you on the edge of your seat. Zahn does an excellent job of developing the characters and creating a suspenseful plot. The novel is also full of interesting insights into the Chiss culture and history. If you are a fan of Star Wars or Timothy Zahn, then you will definitely enjoy Lesser Evil.