Robert Vadra, who has been grilled for two consecutive days, will be back at the Enforcement Directorate office again for questioning in the money laundering case. The central probe agency had questioned him for over 8 hours on Thursday and for almost six hours on Wednesday in connection with alleged criminal charges of dubious financial dealings. The son-in-law of UPA chairperson Sonia Gandhi has been refusing any links with arms dealer Sanjay Bhandari and his relative Sumit Chadha, the ED officials think otherwise. According to the probe agency, a mail reveals the extent of dealings between all three in the money laundering case.