Salmon Fishing in the Yemen is indeed about salmon fishing in the Yemen - or the cockamamie and rather costly notion of building a dam and stocking a waterway in the Arabian peninsula with upstream-swimming fishies imported from the U.K.
Salmon Fishing in the Yemen is, of course, also a romantic comedy, one in which the "he" (Ewan McGregor) and the "she" (Emily Blunt) start off at odds over this dubious exercise in "Anglo-Yemeni cooperation" and end up sharing a tent by a river in southern Arabia, and sharing a crazy dream.
Directed by Lasse Hallström, a man with a lot of eccentric character studies under his belt, Salmon Fishing in the Yemen is based on a Paul Torday book of the same name, a Brit-lit best seller done in the modern-day version of an epistolary novel - lots of text messages, IMs and e-mails. The film keeps some of this, mainly in the cutesy-poo electronic exchanges between Patricia Maxwell (Kristin Scott Thomas), a tightly-wound government press secretary; her boss, the prime minister; and one of his bumbling cabinet underlings.
As for McGregor and Blunt, he's Alfred Jones, a fisheries department bureaucrat in a not-terribly-happy marriage. His passion is fishing (he's famous in some circles for inventing the "Wiley Jones fly"), and he's fussy, tweedy, suburban, and dull. Blunt is Harriet Chetwode-Talbot, a hard-driving marketing exec whose firm has been hired by Sheikh Muhammad (Amr Waked) to facilitate the salmon project - something that will cost the Arab billionaire upwards of 50 million British pounds. (That's more sticker shock than you'll experience at the fish counter of a Whole Foods!)