a. A metal monolith, which had just recently been discovered in the Utah desert, disappeared overnight, leaving tourists mystified.
b. i. People discovered tyre-tracks around the place where the monolith had stood.
ii. Adventurers flocked to the desert to see the strange column.
iii. The last interviewee felt a bit let down when she found the monolith was gone.
iv. The disappearance of the monolith replaced one mystery with another: who put it there, and who took it?