Zach is somewhere in San Diego, and he has our concert tickets! Six premium view VIP tickets to see Tribal Seeds this Friday at the Del Mar Racetrack. Solve the case and you can take five friends! (Must be 21+)

Gumshoes, we need your help! Check back daily for new clues, and follow @zachvanlue for even more hints to his location.

When you’ve got a guess, FILL OUT THE FORM BELOW. You can guess as much as you’d like! On Friday, one lucky detective will win the tickets… assuming that maniac is brought to justice.

So get to sleuthing, and good luck!