What do inflammatory muscle diseases (myositis), myasthenia gravis, Lambert-Eaton syndrome, and dozens of other disorders like lupus and rheumatoid arthritis, have in common?

"Since being on prednisone, I’ve been up and down with my weight and up and down with the milligram dosage,” says Carlie Brinker. “I’m 19, and I’ve been on prednisone for 11 years.”

*Note: In the print edition of Quest, this article was titled "Rounding Up the Usual -- and Not So Usual -- Suspects."

The scene is familiar to everyone who watches crime dramas. The safe has been opened, and the hotel guests' jewelry and other valuables are missing. What happened, and when, and who's responsible?