Welcome back to the Hidden Side! For our second review of the current wave of sets, we are looking at the largest of the five, 70437 Hidden Side: Mystery Castle! This set contains 1035 pieces and retails for US $99.99 | CAN $139.99 | UK £89.99. It is available now in Europe, and will be released later this summer in the US and Canada, likely on Aug. 1.

Read on to discover all the mysteries inside!