A man and a woman in their 20s were discovered dead at a house on Tiber Road, in North Hykeham near Lincoln.
Police were called at around 6.15pm on Sunday, April 3 at the address on Tiber Road, with several marked police vehicles attending.
Officers are treating the two deaths as suspicious. A post mortem is due to be carried out to establish the causes of death.
A scene guard has been put in place whilst officers carry out investigations.
Anyone with information that could assist with officers’ enquiries is urged to contact Lincolnshire Police on 0300 111 0300.