Learn your 1, 2, 3 across the stars, with the help of the Doctor and friends! One Doctor. Two Hearts. Three Knocks. Four Daleks... A Doctor Who counting book with a timey-wimey twist on every page! Featuring Doctors, companions, and monsters both past and present, kids of all ages will love this Doctor Who numbers book. In the wonderful and whimsical style of T is for Tardis, this includes stunning original illustrations, in a retro style, on every page.