Defending the Vanguard (Colony Ship Vanguard Book 7)

In book 7 of the Colony Ship Vanguard series, Paul, Gretchen, Brinley, and Larissa are seeking to find ways to counter the threats to the Colony Ship Vanguard. The alien forces are brutally seeking to take over. Humans are struggling and unsure how to respond. What will happen as the humans work at defending the Vanguard?