There is a hologram of a woman sits behind a window in the Amsterdam’s Red Light District. It appears that she is looking out at passers-by, then appears to knock on the window and breathe on the glass. The glass seemingly fogs up, and the word "help" appears.
This hologram is modeled on Bernadett "Betty" Szabó, a 19-year-old Hungarian sex worker who was murdered in the Dutch capital in 2009. Now, more than 15 years after her death, police are hoping to uncover new information about her killing.