4 Free Ebooks to Read in September 2026 for Mystery, Thriller, and Crime Fans

Solve crimes with these mystery ebooks—free, this month only.

postimage
camera-iconPhoto Credit: Martin Vorel

Those of us who are voracious readers can never get our fill. There is always some intriguing new mystery or riveting new thriller to devour, and an endless stream of new releases to add to our reading wish lists.

But sometimes you just crave a classic. These are the books that created the scaffolding for the genres we know and love—and they are just darn good.

Every month, we’re bringing you a selection of free ebooks to read that are perfect for all you timeless sleuths out there—lovers of all things mysterious and thrilling.

The Fire Within

The Fire Within

By Patricia Wentworth

When Edward Mottisfont dies suddenly from arsenic poisoning, suspicion falls on his nephew Edward. As David Blake investigates, he uncovers a tangled web of family secrets, betrayal, and hidden motives.

With love, loyalty, and sacrifice at stake, the truth behind the Mottisfont family’s tragedy proves more dangerous than expected.

The Man Who Was Thursday

The Man Who Was Thursday

By G. K. Chesterton

Gabriel Syme is a poet-turned-detective who infiltrates a secret anarchist council, only to find himself caught in a bizarre game of deception, paranoia, and shifting identities.

Blending mystery, political intrigue, philosophy, and dark humor, this surreal classic takes readers on a thrilling journey where nothing is quite as it seems.

The Big Bow Mystery

The Big Bow Mystery

By Israel Zangwill

A locked room, a gruesome murder, and no weapon in sight.

When labor activist Arthur Constant is found dead inside his sealed London apartment, former inspector George Grodman and his Scotland Yard rival must untangle a web of lies, betrayal, and political intrigue to uncover the killer.

Witness on the Roof

Witness on the Roof

By Annie Haynes

When young Polly Spencer witnesses a murder from a London rooftop, she becomes the killer’s only living witness.

Years later, now Lady Warchester, Polly crosses paths with the pale-faced murderer once more. As long-buried secrets resurface, she must confront the danger of what she saw that night.