The mob’s top enforcer does not experience fear or pain, he is selfless, loyal and incredibly focused but his life is on the line and he is running out of time because the headstrong and impulsive youth who steals £17m from the mob is always just one step ahead.

Interesting comments.

Consider the following:
[A stone-cold] or [The families top] mob enforcer must [track down GOAL]…
His life is one the line by whom?
Instead of “running out of time”, take how much time he has and translate into your logline e.g. A stone-cold mob enforcer has three days to [GOAL]…
For color, who is this youth? E.g., mob-turned-informant, enforcers apprentice, or bagman? You get the idea.

Hope you find this constructive, take care.