The Flash, Vol. 7: Perfect Storm

Grodd is the main villain here, and manages to be quite interesting, due partly to the particular motivation he's given in this story. Although there's quite a lot of running around and fighting Grodd's allies, the collection manages to rise above that by getting into Barry's head, developing his relationship with Iris and bringing in as much of the current version of the ‘Flash Family' as will fit - and managing to give them all something to do. There's also a calmer section at the end, showing some of the aftermath (although, even for speedsters, the physical damage is arguably cleaned up a little too quickly) until it all ends on a cliffhanger that's going... goodness knows where, really.