Lancaster returns to his family home in the shabby Bunker Hill section of Los Angeles; he'd been away trying to forget his marriage, which went bad after seven months. But absence made his heart grow fonder, and he thinks of his ex-wife (Yvonne DeCarlo) as a piece of apple core that gets wedged between the teeth and can't be dislodged, even with the cellophane from a pack of smokes. Ah, romance....
Lying to himself, he starts hanging around their old joint, The Round Up, hoping to spot her. Neither a ritzy club nor a down-and-out dive, it's a blue-collar night spot divided down the middle, with the bar and phone booth on one side and, on the other, the tables and dance floor. It's there he sees her again, doing a smoldering rhumba with young (and uncredited) Tony Curtis to the insinuating flute warblings of Esy Morales. She's ready to get back together, and so is he, but pride gets in the way; in retaliation, she marries flashy gangster Dan Duryea.
But Lancaster and DeCarlo keep bumping against each other, like cellophane and apple core. When Duryea confirms his suspicions by catching them together, Lancaster weasels his way out of a very tight corner by saying he's planning a job for them - knocking over the armored truck company he drives for, with himself as the inside man. He rationalizes his complicity away by thinking he and DeCarlo will abscond with their share of the loot.
The brutal heist, filmed in a fog of smoke bombs, goes awry, with lives lost on both sides. Lancaster's arm is smashed, but he winds up acclaimed a hero - if one strung up by pulleys attached to his hospital bed. Only his erstwhile friend, a police lieutenant (Steven McNally) figures out the role Lancaster really played, and disgusted by his thick-headedness, warns that he's not safe from Duryea's henchmen, even while he's recuperating. He's right: Lancaster finds himself being abducted to the oceanside rendezvous where DeCarlo is waiting - and for a final reckoning with Duryea.
Siodmak's establishes full command from the movie's first shot - a stunning aerial glide over Los Angeles at night, swooping into the parking lot behind The Round Up where Lancaster and DeCarlo are trysting - to its last, a darkly poetic pietà. Characteristically, he fragments the narrative through flashbacks, counterposing the hopes of Lancaster's return home with the desperation into which he has fallen. He also slows down for virtuosic sequences that only a great director could bring off: a long scene when the heist is being plotted, with the bored DeCarlo smoking cigarettes (`It passes the time') while the Angels Flight funicular railway criss-crosses the window behind her; and an equally long one in the hospital, involving a cranked-up bed, a tilted mirror on the bureau, and a visitor in the corridor - a good Samaritan who turns out to be his worst nightmare.
Criss Cross displays almost documentary-style familiarity with the details of post-war life, when prosperity was finally trickling down to working stiffs. Lancaster's sporty duds showed a new, liberated look that would become the standard for men's casual wear for half a century (and counting), and DeCarlo, at the high-water mark of her career, looks as smashing in her slacks and barettes and print dresses as no woman has since. Siodmak catches the excitement of disposable cash in callused hands, but isn't condescending about it; but overzealous love for it, however unaccustomed, is still the root of all evils.
Another German expatriate like Siodmak, Franz Planer photographed the movie (and it's probably his finest hour, too). He shoots the armored truck from a vertiginous, almost abstract angle as it invades a huge industrial plant, or savors the shadows hurtling across its hood as it speeds across an ironwork trestle. Nor does the living scenery get short shrift - close-ups of both DeCarlo and Lancaster are voluptuous (and Duryea's especially fearsome).
As he was able to do in The Killers, Siodmak keeps the integrity of the script, never lightening the tone or taking refuge in sentimentality. The blend of crime and doomed romance, the tug-of-war between passion and self-interest, finds perfect balance here. Of course, it's the simplest and most infallible recipe for film noir. As DeCarlo says, `Love... love! You've got to watch out for yourself.' If only she'd said it a little sooner.