Sweet, Savage Death (Patience McKenna #1) by Jane Haddam, Orania Papazoglou (Pseudonym) is $1.99 but poorly rated on GR. She got better in later books.
https://smile.amazon.com/Sweet-Savag...t%2C169&sr=1-1
Also on sale for $1.99,
Not a Creature was Stirring (Gregor Demarkian #1) by Jane Haddam
https://smile.amazon.com/Creature-St...7TMR7KW86QN02K