The son of Cheri Garrison who attacks Rose in the hidden room, attempting to assault her. Rose defends herself by stabbing him, and he is later seen lingering outside her new home.
Cheri and Marcus are established as parent and child.
The plot states that Cheri Garrison and her son Marcus accommodated Rachel Winacott.
Marcus was connected to Rachel through the household where she stayed.
Marcus is identified as Cheri's son, and the plot states that Cheri and Marcus housed Rachel before her disappearance.
Their violent confrontation drives the film's climax.
Marcus attacks Rose in the hidden room and tries to assault her, while Rose escapes and stabs him with a knife.
Marcus's actions place Leila in captivity and danger.
Rose finds Leila tied up in the hidden room after Marcus attacks Rose there.
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