Catherine Sefton has 4 audiobooks on Listento.it, narrated by 4 narrators. The most-rated is Emer's Ghost.

The day Ruth Maguire encounters the wet man on the lonely Wrack Road seems no different to any other, but their meeting on the bleak Dooney Headland, where Ruth lives with her mother and brother and little sister, has terrifying consequences. Ruth's ordeal, trapped in her own home with the lives of James and little Katya at stake, builds to nightmare intensity against a background of grey slab rocks and the glittering sea, in a remote place which is a world of its own.
©1991 Catherine Sefton (P)2014 Audible, Inc.

When Emma falls downstairs and bumps her head, the accident produces a second Emma who is transparent and flickery around the edges. Her double - the Other Emma - is invisible to others and plays tricks on the people Emma doesn’t like.... An entertaining fantasy story about a girl and her double from Catherine Sefton.
©1984 Catherine Sefton (P)2014 Audible, Inc.

Bertie was the smallest Boggin in a house full of Bogginses. He was smaller than Max, smaller than Elsie, smaller even than the dog, Tojo. Max and Elsie despised him, and if they ever agreed to play with him, Bertie was all too likely to end up as the Cannibals’ dinner. So he was pleased when he found the Ghost in the coalshed, particularly when the Ghost promised to be his Best Friend.... A funny and entertaining story about a little boy and his phantom friend, from acclaimed author Catherine Sefton.
©1980 Catherine Sefton (P)2014 Audible, Inc.

It was only an old wooden doll with a broken nose that Emer found, but she was sure that there was something special about it. It certainly did some very un-dollike things like crying real tears in the middle of the night, and it was definitely the doll that led Emer to the ghost. But what does the ghost want? Emer is determined to find out – but when she gets on the right track, it seems as though there may be real danger ahead before she can solve the mystery…
©1981 Catherine Sefton (P)2014 Audible, Inc.