A number of huge lights towering over Birkenhead Park have been explained in a letter to neighbours.
People living in the area received communication from a company called Drama Republic to make them aware that filming for an upcoming Netflix series would be taking place.
Many passers by who did not receive the letter were surprised to see huge cranes places around the park ahead of the shooting that will take place on Wednesday night.
The filming crews are in the area to shoot scenes for eight-part drama The Irregulars.
The Irregulars is set in the 1890s and follows the story of the Baker Street Irregulars from Arthur Conan Doyle's Sherlock Holmes novels.
Entirely shot on location in Merseyside, the show is being produced by Drama Republic and will be available for streaming on Netflix later in 2020.
A spokesperson for the production company said in the letter: "We have one scene to film in the park near the entrance arch, which is scheduled for Wednesday, February 5 from 5pm to 11pm.
"Our design department will be 'set dressing' the set for the correct period on Tuesday, February 4 and then returning to take the dressing away on Thursday, February 6.
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"The streetlights on Park Road East and Park Road North will be switched off during our filming hours.
"However the pavements will be lit.
"Traffic control will be in operation on Park Road East and Park Road North, for the duration of takes. The is provided by Hatton Traffic Management."
People living close to the park have been assured that their access to homes and shops won't be restricted by the filming.
It also said: "Access to and from your home or place of work will not be restricted at all, however, we may on occasion as you to wait for a moment for the duration of a take.
"Filming period drama on location relies on the co-operation and goodwill of the local residents and businesses.
"I would like to thank you in advance for your help and support."
In January, city centre filming of the series had to be abandoned when one of the lead actress was injured on set.
The actress is expected to make a full recovery but the production company are focusing on other scenes for the minute.
Castle Street, Ormond Street and Falkner Square have also been used for filming.