Thursday's Folly/The Visitor/The Trouble with Tycoons ~Judson Philips/ Anthony Gilbert (Lucy Beatrice Malleson)/H. Baldwin Taylor (Hillary Waugh) Walter J. Black/Detective Book Club (December 1967) (Original publication date--all 1967)
The Body in the Dumb River ( Murder Masquerade ) ~George Bellairs Poisoned Pen Press/British Library Crime Classics (2020) (Original publication date 1961)