The actress will again be teaming up with Emraan Hashmi for the thriller.
A source told New Kerala: "Prachi will be completely discarding her sedate, coy desi Miss-won't-kiss image and emerge (probably from a pool of sparkling water) as the new femme fatale in tinsel town."
Desai's last turn with Hashmi in Once Upon a Time in Mumbai saw her playing a "girl-next-door" type.
Her co-star is famous for his willingness to get his clothes off in films for lovemaking scenes, and has been nicknamed "serial kisser".
The actor recently got back into the gym to prepare for nude scenes with Jacqueline Fernandez in Murder 2.
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