In London's gritty underbelly, Jayce, a luckless thug with a heart of gold, must retrieve his boss's dog, Diesel, who unknowingly carries a secret that could save a life. As Diesel becomes bait in a chaotic chase through the city's labyrinth of underground tunnels, Jayce navigates deceit, betrayal, and comedic mishaps in a madcap adventure. The race is on to see who will get Diesel first