Warning: This programme deals with adult themes that may not be suitable for some listeners

Criminals are hiding video cameras in hotel rooms across China to secretly film and live stream unsuspecting victims having sex and then selling the footage online. The illegal trade in spycam porn has become a big business, one with devastating consequences for the people whose most intimate moments are made public without their consent. Wanqing Zhang has been hunting the hidden cameras and trying to find those responsible. Can they be stopped?