Book suggestions for non-communists

Hello Comrades, One of my close friends is not a marxist, but is one of those people who probably would be if they got a bit more active with learning/participating.

They are very disillusioned by the systems that be (Capitalism), and hate how badly the US/western imperial core has impacted the middle east, etc.

What is a good, simple and introductory book to Marxism-Leninism for this kind of person? I want a book that won't scare them off, but does not make compromises on marxist-leninist principles.

Thank you.