When an idealistic romantic gets fired from his day job, he is offered a "one-time gig" to break up a girl's relationship for her disapproving parents. This "one-time" gig spreads through word-of-mouth and he ends up becoming a professional match-breaker. However, he ends up falling for one of his clients and must figure out how to balance his secret job with his love-life.

Teenager Darren Shan is an excellent student and the pride and joy of his perfect middle-class family; his best friend is the reckless Steve. When they receive a flyer with an advertisement for a freak show, they sneak to the theater to see the attractions. The ringmaster is a vampire called Larten Crepsley, that has a lethal spider. After the show, Steve tells Darren to go home. However he returns and overhears Steve unsuccessfully trying to convince Larten to transform him into a vampire. Darren steals Larten's spider which bites Steve later and he seeks out Larten asking for an antidote for his friend. Larten proposes a deal to Darren.

Based on a true-story - A Plumm Summer tells the remarkable tale of two young brothers, Elliott and Rocky Plumm, who go head-to-head with the FBI in order to crack the "frog-napping" case and get their beloved TV puppet, Froggy Doo back on the air, all the while become local heroes and best friends.