Sherlock Sam and the Sinister Letters in Bras Basah

 is the 3rd book in the Sherlock Sam series.

Synopsis
Sherlock Sam’s adventures continue, this time in an international school in Singapore! Sherlock Sam is all set to discover what an international school in Singapore is really like, but one of the students is receiving strange letters that are causing grave concern. Can Singapore’s Greatest Kid Detective use his super intelligence to help his new friend?