INVISIBLE marks a change from Christine Poulson’s usual setting of Cambridge, and her hitherto main character, amateur sleuth (academic) Cassandra. I loved the premise of this novel – spending a weekend with a lover once a month, no commitment, no responsibility. But of course things go wrong, and what follows is a gripping story. Poulson’s established strengths are the ability to imbue her fiction with a sense of place, atmosphere, suspense and rising tension. They are all displayed in INVISIBLE, and in this novel, there are also serious themes and she very engaging minor characters. I loved the book.