Four friends start to receive morbid Valentine cards and realise they are being stalked by someone they had spurned 13 years ago. A masked killer is on the loose and Valentine's day is soon approaching.

Researchers on the undersea lab Aquatica have genetically altered the brains of captive sharks to develop a cure for Alzheimer's disease. But there's an unexpected side effect: the sharks got smarter, faster, and more dangerous. After a big storm damages their remote research facility, they must fight for their lives.

Charlie Croker pulled off the crime of a lifetime. The one thing that he didn't plan on was being double-crossed. Along with a drop-dead gorgeous safecracker, Croker and his team take off to re-steal the loot and end up in a pulse-pounding, pedal-to-the-metal chase that careens up, down, above and below the streets of Los Angeles.