Who is the mysterious Justen?
What is the secret of the ancient silver bowl?
Why is the vicious criminal called The Shark so desperate to steal it?
It's a slow day for Alvin's investigators...until they're roped in to search for a stolen car. Meanwhile, Mars Wong turns suspicious when her rich friend, Sabrina Sim, falls for a guy named Justen.
Can the handsome Justen be trusted?
Can the sleuths save Sabrina and her father?
Or will Russian gangsters finally foil their plans?
Only MR MYSTERY knows!