Mara and Sol became a team. They cleaned up the old lamp room and asked the town for help fixing the real light. People who had been scared of the lighthouse for years finally came out to the rock. The mystery had a simple answer: a kid keeping ships safe. Now she had help, and the light never went dark again.

Sol showed Mara a logbook. Every night for two years she had written the time of each flash. But the last three pages were not in her writing. Someone else had been writing entries on the nights Sol stayed home sick. They followed muddy footprints to a hidden room and found an old fisherman who had quietly covered for Sol. 'A ship nearly wrecked here once,' he said. 'I never let this light go dark.' Sol smiled. She wasn't the only keeper after all.