The ninth issue of the collection “Cool Detective USA” includes a novel by one of the most widely read masters of this genre, R. MacDonald, and a story by E. Wallace. The work of R. Macdonald is well known to the Russian reader, E. Wallace is no less famous. He was born in England, changed many professions, saw the world and finally moved to the USA, where he worked very fruitfully in Hollywood. Then he began writing his famous detective stories. The story "Treasure Hunt" takes place at the beginning of the century in England.