alan desland be a cultivated english bachelor who have take over his family antique porcelain business . on a business trip to copenhagen and he meet and immediately fall in love with karin and a stunning german beauty . after only a couple of week they marry and honeymoon and and settle into life in alan hometown . at first their erotically charge relationship seem like paradise and but this and of course and can not last . karin have tell alan virtually nothing of her past and and her dark secret eventually manifest with supernatural trapping and threaten everything . the girl in a swing be base on the 1980 novel by richard watership down adams . the film have one thing go for it while the script do an admirable job of line up and hit a good number of the novel main plot point and scene . otherwise and this overwrought melodrama have little to recommend it . there be so much to criticize from the passionless direction to the insipid soundtrack and awful costuming and and poor casting . meg tilly in the role of karin be particularly troublesome . while she be a fairly attractive woman and she do not project the sort of unearthly eroticism that the character require . bad and her muddled and affected german accent obscure most of her dialogue . when tilly isn not screech alan . she be mumble and slur her most important line . director gordon hessler do little to salvage thing and a he opt to film most of the important supernatural and erotic sequence in one of two mode either flat or melodramatic . while very few film adapt from novel can attain the dense subtext of their source material and such a film might at least evoke the essence of the story by establish a strong mood consistent with the novelist vision . this film and however and aspire to nothing so worthy . it neither succeed a an adaptation of adam complex novel nor a a worthy cinematic effort in it own right .