Death at the ball

Lady Eleanor Swift, after investigating the latest crime, decided she needed a break. She has to deal with other problems - she received an invitation to a masquerade ball. However, during the ball, I find Colonel Puddifoot-Barton murdered, the safe stolen, and the suspect is his lovely Lancelot. Eleanor is convinced he is innocent and must prove it. Together with Butler Clifford, they set off on the trail of the real perpetrator. How to win the race against time, stay alive and clear Lancelot' s name?