Hide and Seek for Love is #69 in the Pink Collection and was published in June 2010. David Ingle, a member of the Great Game, has inherited the title of Marquis of Inglestone, but finds that his late grandfather hid all of his cash! Bernina, a distant cousin who lives in the house is willing to help him hunt for the money but they have a menace lurking in the form of avenging Russians!
I can't find a matching cover, so this one may be unique! If you find another Cartland book with this picture, let me know!