Book cover design - thriller entitled "A Crack In The Rainbow"

Needed: cover design for a thriller set in India entitled "A Crack in the Rainbow". A synopsis of the novel is attached. I would like the cover design to convey a sense of intrigue and tension between the novel’s two main antagonists. I would also like it to convey the sense of a storm brewing. I don’t want the cover design to be stark or hard-hitting, because it should appeal to both guys and girls. The main plot of the thriller: a storm hits the freewheeling, glamorous world of a Mumbai-based ad agency and turns it upside down. A group of powerful politicians has hatched a scam to send black money worth Rs 8,000 crores (about $ 1.5 billion) to Mauritius and bring it back to India as white. They use (as a camouflage) the voting system for a dance talent show on a TV channel called Rainbow Channel for which the agency is doing the advertising. The scam uses hi-tech systems and smartphone apps to stay off the radar of law enforcement agencies. An ethical hacker uses the deep internet and a smartphone worm to crack into the scamsters’ systems and expose them. There is a key sub-plot: two of the agency's top executives are fighting for the CEO's job. One of them is a traitor, with connections to the money-laundering scam’s mastermind. These two executives are the main antagonists in the book. They are from different backgrounds. One is a westernised copywriter with a reputation for violence when drunk. The other is rooted in Indian traditions and ancient yogic practices. These are the two antagonists that I would like featured on the cover. Deadline: I need the design by 28th April, 2014.