Sussex Police are offering a £10,000 reward for information about the suspected murder of a father and son who disappeared in Spain more than five years ago.
Daniel and Liam Poole, from Burgess Hill, vanished after travelling to Malaga in April 2019.
The case, which was turned into a murder investigation in 2022, has now been transferred to UK authorities as detectives believe crucial information may be held within Britain.
The father and son hired a grey Peugeot 308 car upon arriving in Spain on March 31, 2019.
Daniel and Liam PooleSussex Police
Daniel and Liam Poole went missing in 2019
Sussex Police
"Not a day goes by that I don't wonder what life would be like with my dad and brother in it," she said.
"Every day that goes by sees a thought pop into my head about what truly happened and what their last moments might have been like – these thoughts often keep me awake at night.
"I beg and pray that someone could give me and our family the closure we need."
Sussex Police have now taken over the primary investigation from Spanish authorities.
Daniel was 46 and Liam was 22 at the time they went missing
Sussex Police
Detective Chief Inspector Simon Dunn said: "Although Danny and Liam went missing in Spain, we believe there are people in the UK who may hold vital information about their disappearance."
"We understand there may be some who have felt unable to come forward before now, but it's not too late to do the right thing," he added.
The force emphasised that even small details could be crucial in providing answers for the family.
Anyone with information about Daniel and Liam Poole's disappearance can contact police directly through the online Major Incident Public Portal (MIPP).
Alternatively, witnesses can call 101 quoting Operation Pheasant.
Those wishing to remain anonymous can contact the independent charity Crimestoppers on 0800 555 111.
The £10,000 reward is being offered for information leading to the arrest and charge of any person responsible for their disappearance.