|Full name||Mason Bloom|
|Family||Chelsea Bloom - sister (Deceased)
Violet Bloom - grandmother
Robin Bloom -uncle
|Partner(s)||Lavinia De Brills (girlfriend); incarcerated)|
|First appeared||Case #2 Curse of the Bloom Family|
Mason is 18-year-old Bloom family heir, he has wild orange hair and green eyes. He wears a white buttoned shirt under a navy blue jacket with beige linings.
Mason was the one to report his father's murder after finding his body.He claimed that he got home around evening,and he saw his father lying dead.He said that he and his father were in good terms,and that he will find his killer.
Mason was interrogated again after team found love letter from Lavinia De Brills.Mason said that his father never approved their relationship because she is 21 year-older than him.He tried to ran away from castle,but Clive locked him in his room.
Mason was revealed to be innocent after team arrested Lavinia De Brills for murder.
Mason became a suspect after team found out that victim is his sister.He was sad because he lost his father and sister in short time.His mother is not in Grimsbourgh because of her job and he will only live with his grandma and uncle.
Mason was interrogated again after he had a fight with Chelsea's ex-boyfriend Chester Valentine.He said that Chester is not good boyfriend for her and that he forced her to break up with him.
Mason was found innocent for second time after team arrested Chester Valentine for murder.