Books like Invisible by Lorena McCourtney

A writer in a seaside town answers a door that leads him to Hollywood, where a famous actress vanished after receiving a disturbing message, and he sets out to uncover the truth behind her death.

"I very much need to be dead." These are the chilling last words left by a man who had everything to live for but took his own life. In the void that remains stands his widow, FBI agent Jane Hawk, surrounded by questions destined to go unanswered unless she does what all the grief and fury inside her demand: Find the truth, no matter what. People of talent and accomplishment, people seemingly happy and sound of mind, have recently been committing suicide in surprising numbers. A disturbing pattern is beginning to emerge. Jane is determined to give up everything to find out why. And if that means going rogue and becoming America's Most Wanted, then so be it. Those arrayed against her are legion, and devoted to protecting something profoundly important-or terrifying-enough to exterminate any and all in their way. But Jane is as clever as these enemies are cold-blooded, as relentless as they are ruthless. And she is driven by a righteous rage they can never comprehend. Because it is born of love.

A group of proper English women solve murder cases, much like the 'Whodunnit' style of the 'Charlotte McLeod' books.

In an old people's home in California, sleuths Angela Benbow and Caledonia Wingate sift through garbage to find a killer. The novel is at once a mystery and a look at everyday life in a retirement home, with its boredom and the fear of incapacity. By the author of Ho-Ho Homicide (cover)

Blinded teenage Laureth and her brother Benjamin travel from London to New York to find their missing father, relying on their father's training to read patterns, clues, and numbers in a dangerous mystery.