The Blue Cross, one of the UK's leading animal welfare charities, undergoes the Undercover Boss treatment as Kim Hamilton takes a turn cleaning dog kennels and helping cats give birth. Having previously spent over 20 years climbing the ranks in banking Kim Hamilton now uses her business skills in the charitable sector. But ditching her suits for scrubs requires a different skill set, and hiding her identity from the staff and volunteers, who are the backbone of the charity, is even tougher. Can she pose as a volunteer without being unmasked, and what lessons will she learn that could shape the future of the charity?