Thought about your summer yet as it relates to your small group? Will you continue to meet? Will you change up your studies? Will you engage in service together as a small group? Host a Backyard Bible Club in your neighborhood?
If you're planning on a study, I recommend to you "Never Beyond Hope, How God Touches and Uses Imperfect People" by J.I. Packer and Carolyn Nystrom. The book is for those who may struggle with their spiritual failures or doubts: "Can God use me?" "I want to serve God, but I frequently fail!" This book can be a good reminder that God uses and touches sinful people. He always has and he always will. Chapters include Samson, Nehemiah, Simon Peter, Jonah, Martha, and Jacob.
It is always a good idea to continue reading scripture, however! Sometimes we think that we need to do a book study in our small groups, but the most beneficial practice we can engage, is that of reading scripture to, and with, one another. Consider as a group what book(s) you might read together, pouring over the pages each week, meditating on the words and images, memorizing passages, and capturing a fuller understanding using a commentary or study guide.