Sex, drugs and rock 'n' roll — nothing new for the hospitality industry but British hoteliers say loud music, used condoms and alcohol could hint at something darker: modern-day slavery.
Add last-minute bookings, paying in cash or landing without luggage — all are warning signs that human traffickers could be using the cover of hotel life to hold, abuse and sell victims.
Yet for hotel bosses this is just the tip of the iceberg.