Breakthrough

Shown by first publication year; this may not be reading order.

Breakthrough Michael C. Grumley Breakthrough Michael C. Grumley · 2013 · Breakthrough Leap Michael C. Grumley Leap Michael C. Grumley · 2014 · Breakthrough Catalyst Michael C. Grumley Catalyst Michael C. Grumley · 2015 · Breakthrough Ripple Michael C. Grumley Ripple Michael C. Grumley · 2016 · Breakthrough Echo Michael C. Grumley Echo Michael C. Grumley · 2021 · Breakthrough