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
Collective noun have originally been plural in concept, referring to mathematic endeavors, but metonymic shift (the shift in concept from "the endeavors" to "the whole set of endeavors") produced the usage of "mathematics" as a singular entity taking singular verb forms. (A true mass-noun sense of "mathematics" followed naturally.) Nominally singular pronouns can be collective nouns taking plural verbs, according to the same rules that apply to other collective nouns. For example, it is correct usage in both British English and American English usage to say: "None are so fallible as those who are sure they're right." In that case, the plural