Kristen Bell in ‘Heroes’ arc

Kristen Bell is going from solving mysteries to being a part of one.

The 27-year-old actress, who starred for three seasons as teenage detective Veronica Mars on the now-canceled show of the same name, will appear in a multi-episode arc on NBC’s “Heroes” this fall.

“Heroes” creator Tim Kring said Bell’s character, Elle, will appear in October and will be “a sexy, intriguing, mysterious young lady” who will commit a terrible crime, but it won’t be clear whose side she is really on.

Bell also will be heard this fall as the narrator of the CW’s new “Gossip Girl.”