“Just what does this job 'involve'?” “It 'involves' [='entails'] traveling and a lot of overtime.”
No one knew of their romantic 'involvement'. [=no one knew that they had a romantic relationship]
The accident 'involved' three cars. = Three cars were 'involved' in the accident.
(..) Come on! Do not worry old boy, She's as safe as houses, she's with my brother. I'm on my honeymoon! Why did you lead them here? Why did you involve us? There not here for me, There here for you! Fortunately ... So am I. Now mind the door! Good evening. (..)2011 Sherlock Holmes: A Game of Shadows