beauty spot bob up and down. He has a girlfriend, Farisha, but she is not an investigator. Fishing is his favourite hobby. Sinchita: Sinchita can draw very well. She has a cat, Kuching. Sinchita believes relationships do not last long, just like what happened to her father and mother. In The Mystery of the Seventh Sword, she is unintentionally poisoned by The Snake, after she cut her finger with the poisoned envelope meant for Alvin, slipping into a coma. In the next book, The Mystery of the Missing Murderer, she died, leaving five investigators in the team. Tony Hall: Tony likes to surf. He became Wei Ling's boyfriend in The Mystery of the Unlucky Undertaker. He is very patient and always holds up for Alvin. He becomes part of the group in The Mystery of the Clueless Corpse. Tony has not appeared since The Mystery of the Murdered Maid when he went back to America, meaning that he might have left the group permanently. Arpeeta: Arpeeta is Sinchita's little sister and has waited a long time to join Alvin's group of investigators. She first appears, and becomes part of the group, in The Mystery of the Clownish Corpse. She is shown to have a good singing voice (The Mystery of the Christmas Carol), and also writes poetry (The Mystery of the Bothered Brother). Minor characters Sergeant Samuel Soo: He was friends with Alan Soh, Alvin's father. Sergeant Soo always helps Alvin in his investigations, whether he likes it or not. He became protective towards Alvin and his team after he learned that Alan was murdered by The Snake. He has a romantic relationship with Gracie Soh, and they become engaged in The Mystery of the Dead Diva. Gracie Soh: Alvin's mother, who owns a jewelry shop. She is often worried about Alvin's safety during his investigations, especially after she finds out how Alan Soh and Sinchita were killed. The Snake: Master criminal, leader of the city's largest crime syndicate. Alvin's deadliest enemy. He always wears a green reptile mask. He is extremely dangerous and always tries to get rid of Alvin and his team as they always outsmart him. In The Mystery of the Rajah's Ruby, it is revealed he has a daughter, Tai. Tai: Her full name is Tai Pan, based on a poisonous snake. She is very beautiful, and Alvin used to date her until Mars gave him