Oceanside by Roya Akhavan

This book explores the life of the spirit in the overarching context of a love story. After leaving her body at the hospital, Nina soars through the cosmos and enters a new dimension. Now a being of light, she discovers the truth about the betrayal that tore Blake from her life, understands the meaning of eternal consciousness, and engages her new powers to help anguished souls from diverse timelines and cultures. Nina and Blake interact across dimensions, and their love story sheds light on profound existential questions about life, death, and the life beyond. But will they ever be reunited?