Thriller titles fall into a small number of recognisable shapes, repeated across hundreds of books by unrelated authors. The repetition is a signalling system rather than a shortage of ideas.
The title is read before anything else
In a list of search results or a shelf of spines, the title is often the only text a reader takes in before deciding whether to look further.
It has to communicate genre, tone and approximate content in a handful of words, faster than a description can be read.
A title that follows an established pattern accomplishes this instantly, because the reader has learned what that pattern has previously contained.
An unusual title has to be interpreted, and interpretation takes attention the browsing reader is not willing to spend.
Formulas carry accumulated meaning
Certain constructions have become associated with particular kinds of story: domestic suspense, missing-person investigation, unreliable narration, a secret in a family.
When one book using a construction succeeds, publishers apply it to comparable titles, and readers learn the association more firmly with each repetition.
The formula then functions as a subgenre marker that requires no explanation and no space on the cover.
Publishers choose titles, not authors
Titles are frequently changed during acquisition and editing, and the decision involves sales and marketing rather than the writer alone.
Different markets often receive different titles for the same book, because the conventions that signal a thriller differ between countries.
An author's preferred title is regularly replaced by one that tests better with retail buyers, which is a normal part of the process rather than an insult.
Search behaviour reinforces the pattern
Readers looking for more of what they enjoyed search using the language of the books they liked, so titles built from that language surface more often.
Retail systems reward what gets clicked, which pushes new titles towards phrasing that has already proved itself.
Independent authors follow the same signals more aggressively than publishers do, since they can see the search data directly and change a title within a day.
Saturation forces periodic change
A formula that becomes ubiquitous stops distinguishing anything, and books using it blur together on the shelf.
The trade responds by moving to a new construction, which succeeds until it too is copied widely enough to lose its meaning, and the cycle restarts every few years.
The formulas that fall out of use rarely disappear entirely. They settle into the backlist, where they continue to date a book to the years in which the pattern was current.