If you have a enemy and you have tried everything and nothing is happening and you are in a situation that your own life is in danger or your families life. You can do this wazifa. You must be very sure that you have no other solution. 

For 10 days with the intention that you want your enemy to die , at the same place and same time 

read Surah Lahab 1000 times everyday. 

Do not Read Bismillah or Darood/Salavat with this wazifa. 

Your enemy will be killed by Allah in 10 days