The aristocrat father of a new mother who vanished with her sex offender partner and their newborn has urged her to turn herself in.
Film producer Napier Marten says his estranged daughter Constance should get herself and the child to safety.
She is currently missing with her partner Mark Gordon, who attacked a woman in America when he was 14.
Mr Marten told the Independent: ‘Darling Constance even though we remain estranged at the moment, I stand by, as I have always done and as the family has always done, to do whatever is necessary for your safe return to us.
Ms Marten and her partner Mark Gordon have been missing since January 5 after their car broke down and caught fire on the M61. The pair were seen leaving the motorway on foot with their newborn
‘I beseech you to find a way to turn yourself and your wee one in to the police as soon as possible, so you and he or she can be protected.
‘Only then can a process of healing and recovery begin, however long it may take, however difficult it may be.
‘I want you to understand that you are much much loved whatever the circumstances. We are deeply concerned for your and your baby’s welfare.
Constance Marten, pictured on the right, at Mist Mag party in 2013 with two other women
Constance Marten – pictured again at the 2013 party – has been missing for 12 days now
‘I would like you to understand that the family will do all that is needed for your wellbeing.
‘And I also wish you to understand you are much much loved whatever the circumstances.’
Ms Marten has now been missing for 12 days and police say they have a substantial amount of cash on them built up from a multi-million trust fund that lets them live off-grid.
The car the pair was driving broke down and was on fire, as seen in this picture from police
Police released this picture of Constance Marten and Mark Gordon outside East Ham station at around 11.45am on Saturday January 7
They have no luggage with them after most of their belongings were destroyed in a car fire, and are using money to pay for taxis and places to stay.
Police are worried for the newborn and say neither Ms Marten nor the baby have had medical attention since the birth.
The couple are understood to have lived an isolated life since meeting in 2016, with then-drama student Ms Marten cutting off ties with family and friends.
Last September, they began moving around the country, renting AirBnBs for brief periods.
Constance Marten – whose nickname was Toots – comes from an aristocratic family and money
On January 5, they were on the M61 when their car broke down and caught fire near junction four at Farnworth, Bolton.
The couple then walked to Anchor Lane Bridge, where they got a taxi to Liverpool before getting another to Harwich, Essex.
They were seen around Colchester on Friday January 6 and Saturday 7, when they took another taxi to East Ham Station in Newham, London, and were last seen.
Each time Ms Marten and Mr Gordon are seen on CCTV, they are covering their faces or looking away, and have kept the baby covered up.
After her car broke down on the M61 near Bolton on Thursday evening, Ms Marten is believed to have been spotted wrapped in red blanket in Harwich Port, Essex on Saturday at 9am
Constance’s ancestors: Lt. Cdr George Marten with wife Mary and daughters Victoria, Charlotte and Georgina
Investigators say the couple appear to know how to evade authorities – making the search for them harder.
Police believe they could be anywhere in the UK and are appealing to the public to come forward with any information that may help find them.
Some 200 officers are working on the search and have scoured through more than 200 hours of CCTV footage since the pair were last seen on January 7.
Mr Gordon’s conviction relates to a Florida attack on a woman in her early 20s when he was 14.