Poly en Tunisie (1973)

Nathalie Forestier lives with her father in Tunisia where he works at a phosphate mine. One day the payroll lorry for the mine workers is hijacked in the desert and the money is stolen. Nathalie and her two young friends, Victor and Mustapha set out to solve the crime along with a workman called Kerim and of course Poly the pony. Mustapha has a particular interest in catching the crooks as the local police chief suspects his father is involved in the crime.