Top Grossing Mystery Movies in September 2018
| Rank | Title | Language | Domestic | Worldwide |
|---|---|---|---|---|
| 1 | The Nun |  EN | $117,481,222 | $366,082,797 |
| 2 | Project Gutenberg | - | $188,116,796 | |
| 3 | The House with a Clock in Its Walls | EN | $68,549,695 | $131,523,093 |
| 4 | A Simple Favor | EN | $53,548,586 | $97,644,617 |
| 5 | Assassination Nation | EN | $2,005,142 | $2,584,988 |
| 6 | Lizzie | EN | $642,157 | $844,786 |
| 7 | Followed | EN | $538,179 | $546,410 |
| 8 | Mothers’ Instinct |  FR | - | $135,950 |
| 9 | M | EN | - | $71,313 |
| 10 | Lost Child | EN | - | $68,218 |
| 11 | Hold the Dark | EN | - | $27,738 |
| 12 | Beyond The Sky | EN | - | $19,761 |
| 13 | I Think We're Alone Now | EN | - | $3,162 |
| 14 | Don't Leave Home | EN | - | - |
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