Towers of Silence: Part 1 (S05E01)

A mummified body found on a derelict aeroplane leads the team to a similar case. Spence is undercover in prison trying to find out the motive for these deaths from the convicted killer who is too scared to say anything and clearly hasn't killed anyone. The plane victim's uncle arrives from India to tell the team his nephew was investigating a corrupt businessman who had been peddling fake drugs. (iTunes)