The poor Ashby kids, after losing both their parents in an accident, their elder twin brother, Patrick, heir to the family fortune, disappears without a word. Then ten years later, as the property is ready to transfer to Simon, a handsome young man appears at the door claiming to be Patrick, but is it really him? He looks like Pat, talks like Pat and knows all the family secrets. He is soon settled in and ready to gain his inheritance. Only his twin brother Simon knows the guy's a fraud, but he cannot reveal the truth without exposing his own past misdeeds.
Brat Farrar is a classic psychological suspense novel in the style of Alfred Hitchcock, who was Tey's contemporary. For me, it was predictable, but I kept hoping it would end differently. A very quick and enjoyable rainy day kind of book.