How would you construct a literary arc between three plot lines in a novel?  With three characters living out their own story and adventure and their actions and paths cross at separate points to create one epic novel.
Constructing a literary arc between three plot lines in a novel can be challenging, but also rewarding. Here are some steps you can take to create a cohesive story with three separate characters whose paths will eventually converge:

Start by establishing the three main characters and their individual storylines. What are their goals, desires, and motivations? What conflicts or obstacles do they face in achieving those goals? Each character's story should be engaging and compelling on its own.

Begin weaving the three storylines together by introducing points of intersection. This could be a chance encounter, a shared setting or event, or a mutual acquaintance. These intersections should be organic and feel natural within the context of each character's story.

As the characters' paths begin to converge, increase the tension and conflict. Their individual goals and desires should clash, creating obstacles and challenges that force the characters to re-evaluate their priorities.

Once the characters are fully entwined, escalate the conflict and tension even further. The stakes should be high, with each character's fate hanging in the balance.

Finally, bring the story to a satisfying conclusion by resolving the conflicts and allowing each character to achieve their goals in a way that feels true to their individual storylines.

Remember, the key to a successful literary arc with multiple plot lines is to create characters that readers care about and root for, and to ensure that each character's individual story contributes to the overall narrative in a meaningful way.