Three cars were stolen overnight from outside homes in Burnham and Southminster.
A secure, grey BMW 3351 worth £18,000 with a registration of YD09XCJ was stolen off a driveway in The Cobbins, Burnham, overnight on August 12.
The same night a secure, black Ford Fiesta, worth £10,000 with a registration of EY62 WGA was taken from Devonshire Road, in Burnham, and a secure silver BMW 318D worth £12,000, with a registration of YC06CUU, was stolen from a driveway in Kings Road, Southminster.
A police spokesman said there is nothing to link the crimes aside from the date and locations at the present time.
Anyone with information is asked to call Essex Police on 101.