Buchanan.
That’s all they know about each other. 

Leo, Knox, Alasdair & Neil are all Buchanans, but they’ve never met each other, or their biological father whose Will now promises them the world… with metal strings attached. Five years, it says. Five years they must devote to the “family business” that preys on the vulnerable. Then they can take their inheritances and disappear.  
But fate has a curveball in store for each of the brothers…