Teresa aka The Uncertain Widow
Written by
Leslie Charteris
Copyright 1948
First published as The Uncertain Widow in the New York News (1947), then in 2 issues of The Saint Mystery Magazine (US - Jul. 1962 & UK - Aug. 1962) and The Saint Magazine (US - Aug. 1984). Also published in the collections and The Second Saint Omnibus.
Teresa needs the Saint to help her locate her husband in Mexico.