A Kind of Prisoner is the next-to-last (1954) in the Department Z series by John Creasey, and it’s on sale right now in the US, for $0.50 (!!!) at Kindle US, and for $0.99, but discountable to $0.89, at Kobo US. Or it should be price-matchable at Kobo, but not sure it’s worth the hassle for $0.39.
