Midnight Tides is the fifth volume of Canadian author Steven Erikson's epic fantasy series, the "Malazan Book of the Fallen". Although it is part of the larger series, it has only limited references to the previous books. However, it is not a stand-alone volume as the events of the books "Reaper's Gale" and "Dust of Dreams" follow on from it.
The "Malazan Book of the Fallen" series has 7 separate volumes in it at the very least.
My statement is definitely correct because the context states there are two books that follow the fifth volume, Midnight Tides. Therefore, there is definitely at least 7 volumes in the series. 