Ryan North brings the sensational saga of Squirrel Girl to a close! Brain Drain is missing! A sinister face from the past returns! And the hitherto unbeatable Doreen Green will have to face certain defeat in order to save her friend! Because it's Ryan's last story ever, he and artist Derek Charm are going all out to make it completely huge and amazing--and it is going to blow your mind! The most nuts Squirrel Girl tale ever sees lives hang in the balance, narrative threads resolved -and shocking reveals, um, revealed!