"Goblin Island" became the first in the so-called Scottish Sequence of six titles, four of which are set largely in Scotland: "Goblin Island" itself, set on 'Loch Avie', a fictionalised Loch Lomond; "Princess in Tatters", set on 'Loch Ruel', which may be Loch Fyne; "A Holiday Queen", set at 'Morven' on what appears to be Loch Long; and "Schoolgirls and Scouts" set at 'Glenleny', which also seems to be on Loch Long, but a bit further up the loch. Of the other two in the series, "Twins of Castle Charming" - perhaps Oxenham's rarest title - is set largely in Switzerland, whereas "Finding Her Family" has some early scenes set in Ealing and mainly takes place in Saltburn.