CID officers have returned to Daventry after a six-year absence that saw them based in Weston Favell, Northampton.
The return of plain clothes officers is already having a positive impact on crime and has been welcomed by a key figure in the town.
Cllr Chris Millar, leader of Daventry District Council said: “I think it is reassuring, people want to see a police presence in the town centre.
“It is positive news for the town.”
One of the key areas the CID has been working on since its return to the New Street station is burglary, which has risen by 2.7 per cent year on year.
Sgt Sam Dobbs said: “It is great to have CID in the town and they are making a big difference. It has been particularly useful given the recent burglaries at shops in the town centre.
“We’ve been able to have plain clothes officers out in the town centre late at night following the raids.
“Having the officers out and about is clearly working and the public is aware and helping us to tackle this problem.”
The new crime investigation unit has two detective sergeants, 11 detective constables and two case support workers.
A spokesman for Northamptonshire Police said: “These work alongside uniformed officers in Daventry to keep the town safe and support victims of crime.
“In the past their duties were carried out by a satellite office. However, it was felt that the town was best served by having the team on site, overseen by a Northampton-based inspector.”