She s the mystery woman who financial adviser Melissa Caddick could not fool. Ms Caddick went missing from Sydney s eastern suburbs last month, leaving behind a tangled web of greed, suspected fraud and missing millions for her devastated clients to untangle. But one woman, now known as Witness A, was one of the would-be investors who suspected a scam and called it out after Ms Caddick tried to convince Witness A s husband to invest more than $250,000 of their savings, a court has been told. The woman is now a key witness in the Australian Securities and Investments Commission s case against the 49-year-old in the Federal Court of Australia.