Seven Crows order to destroy the cross-border vampiric threat. Riley and Sam cannot count on back-up from their normal team, as high-level string pulling has pushed them off the case officially. The four discover there is more than just seemingly random vampire murders when more than one supernatural threat shows up and local hospitals begin filling with the sick and the dying. Crows are also prevalent as well. Many are mysteriously dying. Living crows seem to be warning the foursome of future threats based on an old poem. The poem goes like this: "One crow sorrow/Two crows mirth/Three crows a wedding/Four crows
Mass noun usage dates back to Old English. In 2008, Tesco changed supermarket checkout signs reading "Ten items or less" after complaints that it was bad grammar; it switched to "Up to ten items" rather than "Ten items or fewer" at the suggestion of the Plain English Campaign. There is often confusion about the two different concepts of "collective noun" and "mass noun". Generally, collective nouns are not mass nouns, but rather are a special subset of count nouns. However, the term "collective noun" is often used to mean "mass noun" (even in some dictionaries), because users conflate two different kinds of