"The Vampire Diaries" season 5 episode 1 premiere is coming to the CW in less than two weeks, and now a new spoiler reveals that Damon is keeping a huge secret from Elena in episode 2. What's the secret?

A synopsis released by the CW today reveals a big spoiler of episode 2 of "The Vampire Diaries," and most likely will later have a big impact on the Damon and Elena's new relationship. Even the episode title of "The Vampire Diaries" episode, which is "True Lies," hints at Damon's big secret.

The secret: Damon knows Stefan is missing, but doesn't tell Elena.

Damon, don't you know honesty is the most important part of a relationship?

Read the full synopsis below, as reported by Zap2it.com:

"Without telling Elena that Stefan is missing, Damon turns to Sheriff Forbes for help finding his brother. Elena and Caroline try to find out who is covering up a campus murder, and a fellow Whitmore student named Jesse (guest star Kendrick Sampson) gives Elena some intriguing information about Professor Wes Maxfield (guest star Rick Cosnett). While Jeremy struggles to return to his old life, he continues to be the only person who can see and talk to Bonnie, but he can't convince her that it's time to let the others know that she sacrificed her own life for his. After learning that Silas is searching for Katherine, Damon asks Matt and Jeremy to keep her out of sight, but the situation quickly spirals out of control. Finally, Nadia (guest star Olga Fonda) uses violence to make a point about her own agenda."

Episode 2 of "The Vampire Diaries" premieres October 10. The CW also release a new batch of promo photos from the "True Lies" episode, featuring our favorite characters. They can be found here.