Gurugram, Dec. 24 -- A probe into an armed cab robbery in Rewari unwittingly led investigators to an elaborate, years-long plot allegedly by a PhD scholar to murder a convicted criminal in a bid to avenge an attack on his father, a disabled police officer, more than three decades ago, police said on Tuesday. The case began in the early hours of December 16, when two men - Devanshu (32) and Shubham Verma (31) - hired a cab from Delhi to Jaipur. On the way, they shot the driver in the leg and later threw him out before fleeing with the car. They were arrested hours later. According to police, Devanshu, a PhD student, revealed he had been preparing for over a year and a half to murder Vinod Fedrick a murder convict from Ajmer. Police said Deva...