In Cologne, large numbers of women reported being sexually assaulted and robbed on New Year's Eve by groups of men described as of North African or Arab in appearance. Stacey Dooley travels to the city to investigate the fall-out of these attacks. She gets to the heart of both the pro- and anti-immigrant protests which have broken out in the city since the attacks, but are activists just jumping on the bandwagon to further their political agenda?