It’s Christmas time in Valleby, and the town is getting ready to celebrate. But when all the lockers at the Valleby swimming pool are emptied during the Big Holiday Swim, it looks like Christmas won’t be very merry. Once again, Lasse and Maja uses their super sleuthing skills to help the police chief track down the mysterious thief before it ruins Christmas for the whole town!

Martin Widmark and Helena Willis bestselling The Jerry Maya Detective Agency series has sold over 12 million copys worldwide. Meet Lasse and Maja, who runs a small detective agency together, in a series of puzzling mysteries for primary school readers. The stories are set in and around the small town of Valleby, and have a rich gallery of characters to be captivated by on the exciting road to solving the mystery.

The Swimming Pool Mystery is the twentieth installment in the series with Lasse and Maja.