An offender forced entry into two houses and stole jewellery at the weekend.
A police spokesman said the properties at Marina View estate, at Dogdyke, were broken into overnight between Saturday and Sunday.
They said the offender forced entry to a window at one home and a door at the other and stole jewellery from within.
Anyone with information should contact Lincolnshire Police by dialling 101 and quoting incident numbers 132 and 249 of April 13, 2014.
Crimes can be reported anonymously by contacting Crimestoppers on 0800 555 111.