Anthony Gilbert 
Ring for a Noose [EPUB ebook] 

A mission to help refugees – but someone has murder in mind… Classic crime from one of the greats of the Detection Club It is at a local watering hole, the Duck and Daisy, that lawyer-detective Arthur Crook happens upon a party of men and women calling themselves the Peace Brigadiers. Their mission is to aid refugees from Europe. But it isn’t long before Crook suspects one of them is using the premises for criminal ends. And when murder strikes Crook becomes entangled in a treacherous plot . . .