Sherlock Sam and the Alien Encounter on Pulau Ubin

 is the 4th book in the Sherlock Sam series.

Synopsis
When weird things happen while camping on Pulau Ubin, Sherlock Sam is convinced that aliens are to blame! Eager to investigate, Sherlock Sam and his not-so-eager robot Watson journey into the wilderness and discover a mystery that’s out of this world. Will these close encounters get the better of Singapore’s Greatest Kid Detective, or will he prove to be a higher life form?