What is the main conflict in Elsewhere by Gabrielle Zevin?

Elsewhere is a novel by Gabrielle Zevin. In this novel, Lizzie has been killed in a hit and run accident. When she wakes on a boat, she thinks that she is dreaming. However, as Lizzie comes to understand the truth, she finds herself fighting reality and breaking the rules to get back to her family. Elsewhere is a fascinating story of what happens to people after death.