Puzzles of the black widowers

Collection of mystery short stories:

"The Fourth Homonym" (1985) "Unique Is Where You Find It" (1985) "The Lucky Piece" (1990) "Triple Devil" (1985) "Sunset on the Water" (1986) "Where Is He?" (1986) "The Old Purse" (1987) "The Quiet Place" (1988) "The Four-Leaf Clover" (1990) "The Envelope" (1989) "The Alibi" (1989) "The Recipe" (1990)