A Necessary Evil  marks the return of  Captain Sam Wyndham and Sergeant “Surrender-Not’ Banerjee, who first appeared in last year’s “A Rising Man.”  Investigating the murder of  their heir to the province of  Sambalpore, Wyndham and Banerjee discover a hot bed of intrigue.  The had offended religious conservatives and his brother, a feckless playboy.  Again, Wyndham  relies on his partner’s in-depth knowledge of Indian culture to crack the case, which is  “even better than his first “(Daily Telegraph).