Topping Out

As two Irish workmen scale the scaffolding of a London high-rise, their jovial storytelling, kindly lessons imparted and joke sharing rapidly descends into distrust, as the boss suspects his young apprentice of being involved with his wife.

Upset and jealousy ensue, which transforms into rage and threats. As they scale the heights across London, the more they learn about each other, the more is revealed.
Secrets are never obvious to those who are closest.