It’s December in a
small seaside town, and Ruby Harper spends her nights looking into her
neighbour’s apartment. Unable to sleep due to insomnia and the heartache of a
family she has run away from, she fantasizes that the mystery man she watches could
be the answer to her loneliness. But one night Ruby sees something unexpected: the
man is not alone; a woman and a child are sharing the apartment—and they never go
outside. Why are they kept hidden?

Then the man is found
half-drowned in the bathtub, a pile of women’s clothes is left on the beach,
and a little girl is discovered, abandoned. Detective Sergeant Joanna Harper is
assigned to the case, which grows more complicated by the minute. Soon, a
shocking revelation and a desperate bid for freedom put Ruby at the centre of a
crime—and hot on her trail is DS Harper, who knows
her better than anyone and is ready to anticipate her every move.