The hungry ghost / H.S. Norup.

Freja arrives in Singapore during the month of the hungry ghost, when old spirits are said to roam the streets. She's struggling to settle into her dad's new 'happy' family, and dreams only of escaping home and leaving this hot, unfamiliar city. Then one night, a mysterious girl in a white dress appears in the garden. Freja follows this figure to lush, secretive corners of the city, seeking to understand the girl's identity. Her search will lead her to an old family mystery -- on that must be unravelled before the month is over, to allow both girls to be freed from the secrets of the past.