Bipasha Basu is gearing up for a double role in her next film, tentatively titled, 'Alone'. In the most unique form, Bips will be portraying a character of conjoined twins in this horror flick. The film's story will have one of the twins becoming an evil spirit. â€œIt's a very challenging film because I play conjoined twins who are very similar to each other but absolutely different characters. It's emotional; the characters are complex and layered.â€ She begins shoot from June 20, and is â€œcurrently researching on conjoined twinsâ€ said Bipasha. For now, Bipasha is doing research for her film by watching documentaries.