"Undertow" is a simplistic example of a good 'B' picture, your basic Film Noir 101 movie. There are no surprises, lots of coincidences and plot contrivances, and the endgame is telegraphed about midway through. Screenwriters could have written this one in their sleep, which may account for the flawed, unsatisfying nature of Undertow.The cast is attractive; several familiar 'B' actors put this picture over with performances that infuse it with much-needed energy. I thought Scott Brady, John Russell, Bruce Bennett and Peggy Dow were just fine, production values were good, but the movie lacks suspense and tension. Every time a crucial scene would come up you just knew the outcome.Nevertheless, 'Undertow" succeeds in its own unsophisticated way, and for 40's theater audiences it would have been a good time killer while waiting for the main feature to come on.

Today ,William Castle is known as the man who bought Ira Levin's "Rosemary's baby " rights and produced one of the best horror movies of all time."Undertow" has a quite derivative screenplay but the director made the best of it and any film noir buff can give it a chance :it thoroughly deserves it.It features at least one unforgettable scene: the chase in the long corridor which gives you goose flesh.Of the two female leads,I prefer Dorothy Hart to the rather bland Peggy Dow.In the 1968 movie Castle produced ,there was a corridor which played a prominent part too.

There's more to Undertow than the first screen credit of young `Roc' Hudson (in fact his tiny role as a police detective barely registers). It's one of a handful of noirs that William Castle directed before turning his attention to, and making his name in, gimmicky schlock. While none of them is so good as his first – When Strangers Marry, with Robert Mitchum and Kim Hunter – they're more than passable. As is Undertow.Scott Brady looks like Lawrence Tierney's kid brother (which in fact he was). In Reno after a stint at a mountain lodge he wants to buy and run, he bumps into an old pal from mobbed-up Chicago (John Russell). They compare the diamond rings they've bought for their respective fiancees, though that doesn't stop Brady from flirting with a girl (Peggy Dow) he met in a casino and shares a flight home with. Since the police meet him at the plane, any extracurricular romance comes to naught, so Brady dutifully hooks up with his intended (Dorothy Hart). Next thing, he's taken for a ride and framed for the murder of unseen crime boss Big Jim, who happens to be Hart's uncle. Trying to clear himself while on the lam, he enlists Dow's help; he also happens to stumble onto the fact that his fiancee and Russell's are the same woman....Undertow is pure story, competently enough executed if devoid of anything particular to lodge in the memory. It preserves evidence of why Brady stayed in his brother's imposing shadow, and leads one to wonder why Hart made so few movies (though, of her handful of credits, roughly half are noirs). While not an essential title in the noir cycle by any means, Undertow was one of the hundreds of titles that went into making it a cycle, and far from the weakest of them.

William Castle was always a B movie director .His talent -amounting almost to genius -elevated some of his 50's work to the status of "event movies" but works like "The Tingler" "Homicidal"and "Macabre"were nothing but glorified B pictures wrapped in the razzle -dazzle of showmanship."Undertow"makes no pretense at being other than what it is-a brisk programmer for the bottom half of double features-and satisfies on this level Scott Brady is Tony Reagon,an ex-con going straight who is framed for the death of a mob boss,Big Jim,and the movie deals with Reagon's fight to clear his name with the help of a sympathetic cop and a schoolteacher with whom he struck up a friendship while en route to Chicago where the bulk of the movie is set.Good use of the Chicago locations and a brisk pace compensate for moderate acting.Its predictable but narrative pace stops it getting tiresome