The offer of a free drink is often one that is hard to refuse.
And it's not something you would expect to receive from the police.
But in an unlikely twist, it is exactly that action that police took to their advantage as part of an undercover sting operation helping them trace 19 suspects wanted in connection with a string of unsolved crimes.
The sting was carried out as part of a month-long campaign targeting serious crime across north Derbyshire.
The letters urged them to take advantage of a complimentary crate of beer courtesy of a marketing company.
A total of 19 suspects, wanted in connection with a range of alleged offences including robbery, burglary and sexual assault, fell for the hoax.
They called the number printed on the letters, which put them through to officers based at Chesterfield Police Station.
Chief Inspector Graham McLaughlin from Derbyshire Police who led the operation, said: 'These suspects are people who have managed to evade arrest for some time so we have used different tactics to find them.