Irrevocable power of attorney.

My sister is a registered member of a matrimonial site and she got a call from a foreigner for marriage proposal who was a resident of uk and was on work visa in mumbai, india for a month. He was also a member of the same matrimonial site, after a month he borrowed a sum of 20000 from her as he was in short of money to get back to his country. Now he wanted to return the borrowed sum and wants to invest money in India by sending money to her account.He asked for her bank details and also sent the following doc mail to be filled,attach and return it back. Please look into the trailing mail. Is this a fraud case? Please help and reply.....!!!! To, Levin & Baldwin Solicitors, 201 Temple Square, 2 Dale Street, Liverpool. L2 5RU. ATTN: Michael Levin Esq, RE: IRREVOCABLE POWER OF ATTORNEY. Today, I (Name …………………………..), of (address ………………………………………………………………………………………………………..) give my Irrevocable power of attorney to Levin & Baldwin Solicitors to act as my attorney. They have been briefed to stand on my behalf for the release of sum of Two Hundred & Fifty Thousand US dollars ($250, 000,00) money of my husband Investment business in India. I am his wife (Mr. James Williams) and the only beneficiary of his fund lodged with the HSBC branch of 770/772 Bristol Road, South Northfield, Birmingham, West Midlands. B31 2NN. United Kingdom. I shall be grateful if you can help me get this fund out as soon as possible. Attached herewith is a copy of my proof identity documents. Yours faithfully, ( your name……………………… ) Signed ……………………………. Date ………………………………